Column deleting

TreeGrid documentation

If it is possible to delete columns from grid.
By default it is disabled!
If deleted rows and columns are visible and colored.
If set to 1, deleted rows and columns are still visible and can be undeleted. The deleted rows are colored in red, it can be changed in Grid.css.
If set to 0, deleted rows and columns are hidden and cannot be undeleted by a user.
Setting to 1 when AutoUpdate is true has no effect – the rows are immediately deleted.
If the confirmation message for deleting row, selected rows, column and selected columns will be shown.
0 - never, 1 - only if ShowDeleted is on, 2 always.
If the column can be deleted.
It is 1 for all columns except Panel, Index and Gantt.
It is set to 1 when the column has been deleted.
The column is hidden if ShowDeleted='0' or visible and colored red (by default setting in Grid.css) when ShowDeleted='1'.
If the column is shown, it can be undeleted.
The deleted column is ignored in summary calculations. The deleted column cannot be moved.
After uploading changes to server or calling AcceptChanges() the deleted column is physically removed from grid.
Called before column is deleted or undeleted. Called to find out if and how can the column be deleted or undeleted.
type = 0 – cannot delete, 1 – user must confirm deleting, 2 - delete, 3 – undelete.
Return new type. Or return the type to not change the behavior.
Returning 2 for deleted column and 3 for not deleted column has no effect.
If fires when deleting selected rows, type = 1 has no meaning.
cols are set if called on deleting selected columns and contains all the selected columns to delete or undelete. For every of these columns is called the OnCanColDelete.
Called when the column is deleted. Called when the column is undeleted. Deletes / undeletes column from grid. Displays changes. Prepares deleting and calls DeleteColT ( ).
type = 1 – delete + confirm dialog, 2 – delete, 3 – undelete.
Only marks the column as deleted.
Returns true if the deletion was done.
If set test = 1, does not delete column, only tests if it is possible, but does not show confirm message, takes it as confirmed.
Deletes / undeletes column from grid. Displays changes. type = 2 – delete, 3 – undelete.
Physically removes the column from grid and data. The column is really deleted, not just marked!
For marking column as Deleted use DeleteCol() instead.
Remember, removed column cannot be used in any API function, especially take care in loops, you cannot use GetNextCol / GetPrevCol functions with removed column. Deletes (del = 1), or undeletes (del = 0) or removes (del = 2) all given columns in grid.
Returns final count of affected columns. Deletes / undeletes column from grid. Displays changes. type = 2 – delete, 3 – undelete.
Deletes actual or focused column, the column is marked as Deleted. Undeletes actual or focused column. Physically removes actual or focused column. Deletes all focused columns, the columns are marked as Deleted. Without ...F fails if the actual column is not focused. Undeletes all focused columns. Without ...F fails if the actual column is not focused. Physically removes all focused columns. Without ...F fails if the actual column is not focused. Deletes all selected columns, the columns are marked as Deleted. Without ...F fails if the actual column is not selected. Undeletes all selected columns. Without ...F fails if the actual column is not selected. Physically removes all selected columns. Without ...F fails if the actual column is not selected.