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TreeGrid versions compatibility

Changes log (txt file) Using custom CSS from 13.3 to 14.0 Upgrading from 9.3 to 10.0 Upgrading from 5.9 to 6.0

Using in JavaScript frameworks

Angular React Vue Other frameworks NodeJS server

Creating grid

Simple examples Basic information Creating grid Deleting grid Reloading grid Rendering grid Accessing grid by API

Data & communication
Data communication with server

Communication types AJAX communication AJAX SOAP envelope Submit communication Directly included data Data from JavaScript Cross domain / local load by JSONP Sessions (AJAX) Server response (AJAX) Synchronous communication (AJAX) Caching (AJAX) API (AJAX)

Download data

Settings for data download Layout XML structure Data XML structure

Upload data

Settings for data upload API for upload XML structure sent to server

Changing data from server

XML structure of download changes XML structure of request for a cell Synchronizing data with server

Input / output data formats

Complete list of tags Internal XML format Short XML format Extra short XML format DTD XML format JSON format

Cell basics

Cell type Cell format Dynamic format Dynamic type Cell value Reading / writing attributes by API Cell HTML Cell default Range or more values in one cell Cell with link URL Cell hint Cell tooltip / title Cell popup menu

Cell editing and changing values

Cell editability Dynamic editing Locking Defaults list Suggest list (auto complete) Tags input Changing cell value Mass cell change Clearing cells Editing cells Controlling <input> tag by JavaScript Input validation and restrictions Side checkbox Cell selecting

Calculations - cell formulas

Basics Formulas Mathematical functions Aggregate functions Special functions for actions Custom functions

Calculations - editable cell formulas

Basics Suggest list (auto complete) Defined names Actions for choosing cells Conditional functions Lookup functions Cell reference functions Logical functions Informational functions Mathematical functions Trigonometry functions Rounding numbers Number conversions String functions Date functions Summary functions Custom functions

Cell side buttons

Introduction Right side Button Left side Icon

Cell spanning

Column span Row span Dynamic spanning

Cell style and color

Basic grid style Sizing and scaling - responsive design Dynamic cell style attributes Cell CSS class Cell background color Dynamic cell border Cell HTML style Row color alteration Cell mouse cursor

Editable cell images

Insert image Edit image

Cell types
Automatic type - Auto String - Text, Lines & Pass
Number - Int & Float

Format Localization

Date and time - Date

Format Calendar component Dates dialog Localization

List & combo - Enum & Radio

Introduction Definition Related lists Enum specific Radio specific

Checkbox - Bool
Action button - Button

Introduction Basic clickable button Switch button Radio / tab button Menu button Combo switch button Combo radio / tab button Special Space rows with buttons

Panel with more buttons - Panel

Definition Standard fast panel Custom panel

HTML and special types

Html type EHtml type (editable) Icon type Abs type List type Editable Link type Editable Img type DropCols type Upload File type


Column basics Column index Column visibility Column visibility menu Column selecting Column tree Auto column tree Column position and moving Column adding and copying Column deleting Column width Column API

Row basics

Rows by functionality Rows by position Row name Row id Row index

Default rows

Description Example of default rows Example of changing default row Attributes

Row tree

Tree attributes Actions & API for expand / collapse

Row identification

Setting row id attribute Row id attribute in tree Row id created from cell values API for row ids

Row visibility
Row adding and copying

Five ways of adding rows to grid Adding and copying restrictions Adding new empty rows Copying existing rows

Row deleting Row moving and dragging Row selecting Row height Row API Space rows
Sorting rows

Sort settings Controlling sort position Comparing strings Sorting actions Sorting API

Grouping rows to tree

Group settings Creating groups Comparing strings Created group rows <D Group='1'/> User interface to choose grouping Grouping actions and API

Filtering rows

Filter settings Comparing strings User interface to choose filter Filter actions and API

Searching in rows and cells

Search settings User interface for search Search actions and API

Printing grid

Print settings Choosing items to print Page size Print API

Print / export to PDF

Introduction Client side settings Printing options Client side API Server side API Data sent from client to server

Export to Excel or CSV

Introduction and export types Basic settings Styling export XLSX export Gantt export CSV export Old XLS / XHTML export Export API Communication with server Client export Server export

Import from Excel

Basic settings Sheets manipulation

Copy & paste rows via clipboard

Copy & paste permissions Copying to clipboard Pasting from clipboard

Master - detail grids

Introduction External master - detail grids Nested master - detail grids Synchronizing grids Other attributes for master - detail

Pivot tables

Pivot attributes & API Pivot formulas

External objects (like Adobe Flash) Undo & Redo
Gantt and bar chart
Gantt objects

Gantt objects list Display settings Edit settings

Main bar

Definition of main bar and plans Main bar as Task Edit settings Main bar content and side html Tip on mouse hover Vertical position and height Style specific attributes API to manipulate Main bars Actions Side text (deprecated) Real Flow (deprecated)

Run bar

GanttRun Definition Extended definition Run bar as Task Edit settings Save format Selecting Run boxes Run box content and side html Tip on mouse hover Box identification Vertical position and height Style specific attributes Overlaid (Error) boxes Containers for more boxes Dragging - moving and resizing API to manipulate Run boxes Actions Run special formulas

Summary task

Main for Main Main for Run Editable Main Editable Run

Gantt icons - Flag & Point

Flag - icon with text Point - math points

Gantt display objects

Header - column captions Cell and column Background Vertical movable Line Mark & Progress line

Gantt zoom

Zoom options Chart size limits Zoom selection Paging in Gantt chart

Dependency, constraints & schedule

Introduction Data units Defining dependencies Dependency colors and shapes Changing dependencies Correcting dependencies Scheduling algorithm Project date constraints Task date constraints Critical path - Slack (Float)

Gantt calendars

Global base calendar Local calendar Calendar list Calendars dialog Other settings

Gantt resources

Resources list Resources assign Resources filter Resources calculations Availability chart Resource usage chart Generated resource usage chart

Gantt popup menu Gantt API
Line and XY points charts

Charts in grid cells Chart JSON definition Base chart settings Basic attributes Size Axis and caption Individual chart lines Data sources Visual settings API for standalone usage

Paging in large grids
Paging root rows

Paging types and attributes Auto adding root pages API for paging

Pager components

Side pager Side pager type Pages Side pager type Gantt Side pager type Custom Pager with navigation buttons & edit Pager as list of page indexes

Paging in tree

ChildPaging - load / render on expand MaxChildren - limit children count ChildParts - load / render on scroll

Paging columns

Paging types and attributes Auto adding column pages API for column paging

Server paging

Server paging for root rows Server communication in root paging Root paging in very large tables Server paging in tree Server communication in tree paging XML Request for Data in root paging XML Download Data in root paging XML Request for root Page / children XML Download root Page / children API for server paging

TreeGrid DLL/SO for server paging

Introduction Compatibility with TreeGrid control Using TreeGrid server DLL/SO ASP.NET C# ASP.NET VB PHP JSP Java TreeGrid server concepts Function reference Calculations

JSON menus and dialogs
JSON menu description JSON menu definition example
Menu settings

Base attributes Visual settings Key navigation Behavior Size and scroll

Menu item settings

Base attributes Clickable item Inactive caption Collapsible sub level Popup sub menu Columns Bool item Enum item Edit item

Custom menu in JavaScript

Show custom menu Custom menu position Custom menu advanced settings Custom menu JavaScript events Custom menu JavaScript methods

Calendar dialog Custom calendar & JavaScript events Custom dialog in JavaScript
Global grid settings
Grid size and scroll

Default behavior Maximize grid height and width Update size according to the content Let a user to control the grid size Widths of individual sections Other scrolling attributes and API

Media rules - responsive design

Language & regional setup (Text.xml) Translate texts dynamically Change language

Grid cursor - Focus & hover

Focused cell and row Focused cell range Move and copy focused cells Filling cell values by dragging Tabulator navigation Key navigation Cursor look - focus & hover

Selecting rows, cells and columns

Selecting base Selecting rows Selecting cells Selecting columns

Global settings

Status messages Configuration menus Configuration menu - options Configuration menu - columns Configuration menu - print / PDF Configuration menu - export Default toolbar Useful API function Help file


Animations base Row animations Column animations Cell animations Animations for undo / redo Animations for server side changes Dialog animations

Grid configuration in cookies
Mouse & key events & actions

List of event handler types TreeGrid mouse events Mouse event names Key and mouse button prefixes Touch event names Event targets Assigning event actions / callbacks Event action parameters Action name suffix Calling actions from JavaScript Creating custom actions Focused vs. Actual cell TreeGrid key events JavaScript API events

Mouse API event TreeGrid files
Debugging and testing

Debug window Automated testing

Gantt objects

TreeGrid documentation

The Gantt chart can be added to grid by defining column of type Gantt (<C Type='Gantt' ... />) and setting the other Gantt chart attributes.
The grid with Gantt column still supports all other functionality like normal grid (sorting, filtering, grouping, search, calculations, ...).
The Gantt chart is automatically created from the given values and is also automatically recalculated whenever some source value is changed.
The Gantt chart is also interactive, so a user can change the Gantt chart by mouse and it automatically updates the source data.
The Gantt chart sources are usually other columns where are stored the source data in cells. These cells can be also edited by a user and Gantt chart is automatically updated.
Predefined settings for Gantt column is in default column <D Name='Gantt'/>, defined in Defaults.xml.

Gantt objects list

The Gantt chart can show various objects, possibly all together in one cell:

Gantt bars

Resizable, movable, support dependencies, resources and percentage completion
Used as sources for Gantt chart calculations (e.g. correcting dependencies or calculate critical path)

Main bar & milestoneBase Gantt chart task.
One or more independent bars with different color, class, caption, tooltip and unique id. Supports also milestones.
Defined by GanttStart (start date) and GanttEnd (due date) or by GanttStart (start date) and GanttDuration (length) as one continuous bar. Or defined by GanttParts as more discrete bars.
Supports more tasks (plans) in one cell, the count of the plans is defined by GanttCount. The plans are independent, can have their own dependencies, resources or percentage completion. Every task in individual plan can be discrete or continuous.

Run bar & milestoneExtended Gantt chart task or more independent tasks in one cell.
One or more independent bars with different color, class, caption, tooltip and unique id. Supports also milestones.
It supports also many options for moving and resizing the boxes.
Defined by GanttRun and optionally GanttRunStart. Or can be defined as summary of child main bars, see Editable Summary Run.
Can be used as complex planned task or more independent planned tasks.
Or can be used to define PERT chart.
Or it can be used for any other interactive bar chart.

Gantt icons

Not resizable, but movable objects

FlagOne or more icons in the cell, on specified dates, with defined side text or tooltip. Supports custom icons and their changing.
Usually used to attach some information and icon to selected date(s).
Defined by GanttFlags.
Does not> affect any Gantt calculations, except width of the Gantt column.

PointOne or more different movable bullets. With different icons, tooltip and edit permissions.
Used usually in math charts to display various points on specified positions.
Defined by GanttPoints.
Does not> affect any Gantt calculations, except width of the Gantt column.

ConstraintTask constraints, specify limits where the Gantt bars (and optionally Gantt icons) can be moved or resized, used also for Gantt calculations.
Four different constraints: early start (GanttMinStart), late start (GanttMaxStart), early end (GanttMinEnd) and late end (GanttMaxEnd).

Static objects

Not movable, not resizable, completely inactive

MarkOne or more dates or date ranges to highlight them. Can be different in every row and also input by a user.
Defined by GanttMark.

Availability (Chart)Availability or resource usage chart.
Defined by GanttAvailability.

Local calendarGantt calendar - excluded dates (holidays). Marks these dates by different color.
It is used in all Gantt calculations and is also possible to restrict start / end Gantt objects in these ranges.
Defined by GanttCalendar.

Global objects

Objects defined for the whole chart or between cells

DependenciesLines between two Gantt bars (Main or Run bars or their milestones). Even between different bars in one cell.
The dependencies set relation between the tasks and are used in Gantt chart calculation (e.g. correcting dependencies or calculate critical path)
The dependencies support edge type (ss,sf,fs,ff), lag and float.
The dependencies can be added, deleted and changed dynamically by mouse or keyboard.
Defined by GanttDescendants and / or GanttAncestors.

Start lineVertical line through all cells that specifies start of the whole project. It can be set, deleted or moved.
It is used in Gantt calculations, when correcting dependencies. It can work also as constraint.
Defined by GanttBase.

Finish lineVertical line through all cells that specifies end of the whole project. It can be set, deleted or moved.
It is used in Gantt calculations, when correcting critical path. It can work also as constraint.
Defined by GanttFinish.

HeaderOne or more Gantt header (up to 5), can be placed above or below (or both) the Gantt chart in fixed rows.
Shows the individual dates in given format or numbers in math chart.
Defined by GanttHeader1 - GanttHeader5.

BackgroundBackground lines or rectangles vertically through all cells to mark and highlight some dates or date ranges in the chart.
Defined by GanttBackground.

Global calendarGantt calendar - excluded dates (holidays). Marks these dates by different color. The dates can be also hidden from the chart.
It is used in all Gantt calculations and is also possible to restrict start / end Gantt objects in these ranges.
Defined by GanttExclude.


They are not visible objects, they are listed here just for completion

ResourcesInformation assigned to any Gantt bar (Main or Run bar or milestone).
Used for calculating task prices and Availability chart.
It is possible also to display resources chart as inner text, side text or tooltip for Gantt bar.
Defined by GanttResources.

Critical pathGantt chart can calculate slack value for all tasks and mark tasks on or beyond critical path.
The Gantt bar on critical path is highlighted.
Defined by GanttSlack.

Summary tasksGantt chart can show various summary tasks calculated from their children.
The can be movable, resizable and with dependencies.
Defined by GanttSummary as Main bar or GanttRunSummary as Run bar.

ZoomZoom levels, possible from milliseconds to years. Smooth zoom available. Zooming by mouse dragging or clicking to date.
Defined by GanttZoom.

MenuPopup menu for the Gantt cell with items available for the clicked Gantt object.
Defined by GanttMenu.

APIGantt supports also various API methods and events to control end extend the Gantt chart from JavaScript.

Display settings

new 6.3 upd 10.0 <C> string


Comma separated list of all Gantt objects to render, case insensitive.
The order of rendering the Gantt objects. The objects rendered later will overlay the previous objects in the same place.
The not listed Gantt objects are never rendered.
It affects also accessibility (interactivity) of the objects, they are accessible in reversed order.
Since 10.0 it can contain also the next main bars keywords Main1, Main2, Main3, ..., Main10. If missing, these keywords are automatically added after Main keyword if increased GanttCount.
Order for export is defined by GanttExportOrder.
new 10.0 upd 16.0 <C> string


List of Gantt bars used as Gantt tasks, comma separated, case insensitive.
The Gantt tasks can have assigned dependencies and resources, can have percentage completion, can be disabled or locked and can have manual constraint.
Permitted objects areMain, Main1, Main2,... MainX for individual main bar plans. The whole main bar in one plan (not its individual Parts) is used as Gantt task.
All for all main bar plans.
Run for whole run bars. The whole Run is used as Gantt task. It should not be set with Box or Container.
Box for individual Run boxes. Every Run box can be used as one Gantt task. The box must have set Id attribute to have assigned dependencies. It should not be set with Run.
Container (new 16.0) for containers with Run boxes. Every Run container can be used as one Gantt task. It should not be set with Run.
It replaces deleted GanttObject and GanttDependencyObjects attribute.
new 10.0 API method void


(string value, string col = null)
Changes GanttTask value by JavaScript. Requires next RefreshGantt ( ) call.
value is new value to set to GanttTask, col is Gantt column or null for the first Gantt column in grid.
new 6.4 deleted 10.0 <C> string


Replaced by GanttTask.
Since 10.0 the dependencies and resources can be assigned to all Gantt tasks, not only to the first one in the cell.
new 10.0 chg 13.0 <C> int


If set to some number (including 0), it updates row height to show all Gantt objects fully plus given pixels.
Since 13.0 if not set (default setting, changed from value 4 in 13.0) it is read from actual CSS style.
It is space in pixels reserved below Gantt objects.
It changes row Height attribute value. The calculated height cannot be less than minimal row height and higher than row MaxHeight.
It calculates the row height from:
Main bar or Run bar if it uses default height and position or if uses explicitly set height and position.
Main milestone and Run milestone position and default milestone height. See GanttIconBottom.
Run bar placed by OnGetGanttRunRect.
Overlaid Run bar if it is shifted by GanttRunErrorsShift.
Flag, Point or Constraint position and default object height. See GanttIconBottom.
It ignores:
If the Run or Main bar height is higher than default box height due its html content
The Main and Run bar side html
Set it to empty string to not update row height according to the Gantt objects height and position.
Incompatible with RowSpan for the Gantt cell.
new 10.0 chg 13.0 <C> int


If it is not empty string, it is used instead of GanttBottom for Gantt icons (Flag, Point, Constraint).
Since 13.0 if not set (default setting, changed from value 0 in 13.0) it is read from actual CSS style.
It is used only if set GanttBottom.
new 15.0 <C> bool


[0] Saved to cookies, to avoid it set GanttLap='1'
If the cell horizontal border is shown also in Gantt chart. Only if the Grid CSS style defines it.
new 13.2 <C> bool


If the row height is updated for GanttBottom even if the run boxes are outside Gantt page (for GanttPaging).
It is applied only for run boxes, for other Gantt objects is the height updated always.
new 9.3 chg 13.0 upd 15.1 <C> int


For 0 it always shows all texts in Gantt through other objects (e.g. images or bar backgrounds).
For 1 it overlays the texts like any other Gantt objects by the next objects in the GanttOrder. It can slow down bigger Gantt charts!
Since 13.0 If set to 1 it also renders background in <svg> to speed up the rendering.
Since 15.1 If set to 2 it works like 1 but does not render backgrounds in <svg>.
Therefore the value 1 speeds grid with custom row calendars and / or with many colored exclude or background units. But slows down Gantt with many main parts or run boxes per row.
new 10.0 <C> string[*]


A list of icons for hovering custom icons in Gantt chart - Main and Run milestones and stops, Flags, Points, Constraints
It is first character separated array of string pairs, the first string is replaced by the second string.
If more strings match the search, only the first string is replaced.
For example "|Test.gif|TestH.gif|.gif|Hover.gif" replaces Test.gif by TestH.gif and Custom.gif by CustomHover.gif.
new 10.0 upd 16.0 <C> int


If there will be shown vertical line(s) when dragging Gantt object to better see the destination dates.
0 - no, 1 yes, but run only for slide, 2 yes, also on run move, left edge only, 3 (new 11.0) , yes, also on run move on both sides.
Since 16.0 if set 3.bit (&4), it does not show the vertical lines in this grid, but still shows the lines in other grids when dragging run between grids.
The line is not shown if set <Cfg ShowDrag='0'/>.
new 11.0 <C> int


If and how there will be shown tip for actual position when dragging Gantt object. Bit array.
1. bit&1There will be shown start date when moving GanttRun. Only for move, not for slide.
2-3. bit&6There will be shown (2) start date or (4) end date or (6) both for moving any Gantt object. For moving icons and lines there is shown always only start date.
4-5. bit&24There will be shown (8) edge date (start or end) or (16) duration or (24) both for resizing any Gantt run box.

new 11.0 <C> string


[ ]
Date format to display start and end of the Gantt item in GanttDragTip.
It is the same format as for Date type.
new 11.0 <C> string


[ ]
Number format to display duration of the Gantt item in GanttDragTip, the duration is shown in GanttDataUnits.
It is the same format as for Float type.
new 11.0 API event string


(TGrid grid, TRow row, string col, string tip, object XY, int dir, int start, int end, int duration, int x, int y)
Called to get a tip text for Gantt object to display it on dragging like GanttDragTip.
tip is the default tip text, return it or new tip.
XY are Gantt objects under mouse cursor on dragging start returned by GetGanttXY.
start is actual start date in ms, end is actual end date in ms, duration is actual duration in ms. end and duration is null for GanttRun move.
dir is action: 1 resize left edge, 2 resize right edge, 3 move.
x is actual position in Gantt in pixels, y is vertical position in pixels. x and y is set for GanttRun move only.
new 10.0 <C> int[3]


How will be shifted Gantt icon in case two same icons are on the same place or too near.
It can contains one or three values, comma separated as [shiftX,shiftY,overX], e.g. GanttShift="0,3,5" or GanttShift="2".
shiftX - how much pixels will be shifted the next overlaid icon horizontally. It shifts the icons up to shiftX pixels distant.
shiftY - how much pixels will be shifted the next overlaid icon vertically. It shifts the icons up to overX pixels distant.
Affects Milestone (Main, Run), Flags, Points. For Run it works only if all the milestones are on the same vertical level. For Main it works only if the Parts are sorted by date.
new 10.0 <Cfg> int


Only for touch screens. <Cfg> attribute!
If set to 1, it permits dragging only focused object (row, image, Gantt bar, Gantt icon or Gantt line). It affects also link navigation.
If set to 2, permits dragging focused cell, not only focused row. Gantt is the same as for 1.
First tap on the object to focus it and next touch and move or resize it.
Similarly tap to empty space in Gantt chart and next touch and drag to create new bar.
It affects also showing Gantt menu - tap on the Gantt object and tap on it again to show the popup GanttMenu.
new 12.0 chg 12.1 <Cfg> int


Only for touch screens. <Cfg> attribute!
If set to 1, it permits dragging dependency only from focused cell.
If set to 2, it permits dragging dependency only from focused Gantt bar or milestone.
First tap on the cell or object to focus it and next touch and move to create the dependency.
Since 12.1 the default value changed from 0 to 2.
new 10.0 <Cfg> int


Only for touch screens. <Cfg> attribute!
Time in milliseconds; after that time the focus from actually focused cell or Gantt object is cleared.
0 means never.

Edit settings

renamed 10.0 upd 15.1 <C> <cell> string[ ]


Which Gantt objects can be edited / moved / changed / deleted / added by user. Comma separated list of flag names, case insensitive.
It does not affect editing values in the source cells - use standard attributes like CanEdit to restrict source cell editing.

AllAll Gantt items are editable / movable.
MainMain bars and milestones can be created, deleted and modified directly in Gantt chart.
(new 10.0) Individual actions can be set by MainMove, MainResize (resize+split), ManResizeLeft (new 15.1, resize only start), ManResizeRight (new 15.1, resize only end), MainNew (add+delete), MainComplete, MainText, MainState (disable, lock), MainCorrect (schedule).
MainX(new 10.0) It can contain also the Main1, Main2, Main3, ... MainX.
The individual actions can be set by MainXMove, MainXResize (resize+split), MainXNew (add+delete), MainXComplete, MainXText, MainXState (disable, lock), MainXCorrect (schedule).
RunRun bars can be created, deleted and modified directly in Gantt chart.
(new 10.0) Individual actions for whole run can be set by RunMove (move+join), RunResize (resize+split), RunNew (add+delete), RunComplete, RunText (run text, type, tip, class), RunState (disable, lock, select), RunCorrect (schedule)
(new 13.0) Action for run container can be set by RunContainer
The Run can be more controlled by its attributes for moving and resizing.
FlagsFlags can be created, deleted, moved and modified directly in Gantt chart. Since 10.0 individual actions can be set by FlagsMove, FlagsNew (add+delete), FlagsText (text+icon change).
Points(new 6.4) Points can be created, deleted, moved and modified directly in Gantt chart. Since 10.0 individual actions can be set by PointsMove, PointsNew (add+delete).
Constraints(new 6.3) Constraints can be created, deleted and moved directly in Gantt chart. Since 10.0 individual actions can be set by ConstraintsMove, ConstraintsNew (add+delete).
DependencyDependency lines can be created, deleted or corrected directly in Gantt chart.
(new 10.0) Individual actions can be set by DependencyNew (create+delete), DependencyCorrect (moving related tasks, can be set individually also by MainCorrect, MainXCorrect and RunCorrect).
DependencyTypes(new 6.3) Dependency type can be set by dragging to different bar edge (ss,sf,fs,ff). It does not hover the dependency as editable.
DependencyLags(new 6.3) Dependency lag can be changed from menu. If set, dependency is hovered as editable, even if no other Dependency edit flag is set.
ResourcesResources can be assigned or entered directly in Gantt chart.
CriticalPath(new 11.0) Provides slack and critical path calculation even for not editable chart. It is set also when <Cfg Editing="0"/>.

For example GanttEdit="Main,Main1Move,Main1Resize,Main2Move,Main2Complete,Run,FlagsMove,Constraints"

More control can be done by assigning actions to events. The default actions are attached in Defaults.xml:
OnDragGantt="ResizeGanttMain OR MoveGanttMainFirst OR ResizeGanttRun OR MoveGanttRun OR MoveGanttFlag OR MoveGanttPoint OR MoveGanttConstraint OR MoveGanttBase OR MoveGanttFinish OR CreateGanttBar OR DragGanttDependency"
To attach special set of actions to inividual Gantt cell, define <I ... xxxOnDragGantt="....,1" ... />, where the xxx is name of your Gantt column. See ",1", it ensures to not run the default actions from Defaults.xml.
For example <I ... GANTTOnDrag="MoveGanttMain OR MoveGanttConstraint OR MoveGanttBase OR MoveGanttFinish OR DragGanttDependency"/>,
permits only moving specified objects, but restricts resizing, deleting and creating new objects.
Remember, you can use Default rows <D> to assign the same actions to more cells at once.

Use also OnCheckGantt event to control changes done by direct editing in source cells.
Use also GanttMenu to specify popup Gantt menu items for given cell.
new 15.1 API event string


(TGrid grid, TRow row, string col, string edit)
Called to get the GanttEdit value for given cell dynamically. Return new edit string.
new 6.3 upd 7.0 <C> int


Check if Gantt source cell change by a user edit is correct.
0 - do nothing
1 - restrict incorrect changes
2 - alert warning and restrict incorrect changes
3 - (new 7.0) automatically correct incorrect values
4 - (new 7.0) alert warning and correct incorrect values
It checks all dates to be within constraints, circular dependencies, percentage complete, negative duration, End>Start
To set value to Gantt source cell by API use: val = grid.CheckGantt(row,col,val); if(val!==false) grid.SetValue(row,col,val,1);
new 7.0 <C> int


Time in milliseconds, how long will be displayed alert message for GanttCheck = '2' and '4'.
If set to 0, the message will be shown forever with OK button.
If set to 1, standard browser alert will be shown.
If set to negative number, the message will be shown for the (positive) time, but with OK button.
renamed 6.0 <C> <cell> int


If the Gantt items under mouse cursor will be highlighted.
0 - never, 1 - only when it is editable / movable, 2 - always

DeleteGanttAll ...FA

Not attached to any event
Deletes all Gantt items from the actual or focused Gantt cell, including all dependencies.