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Gets or sets the index of the column that displays the tree outline (expand/collapse buttons and indentation) in Treegrid.
public virtual int TreeColumnIndex { get; set; }
Public Overridable Property TreeColumnIndex As Integer
By default (value = -1), the tree outline is shown in the first visible column. Set this property to display the tree outline in a specific column. This API only works in TreeGrid, not in Group.