Hi AR,
You can control the visibility of the columns in the GridTreeControl by using the below code snippet,
//Hide
this.treeGrid.Model.ColumnWidths[3] = 0;
//Show
this.treeGrid.Model.ColumnWidths[3] = 80.0;
Sample:
http://www.syncfusion.com/downloads/Support/DirectTrac/88696/TreeGridBinding652655451.zipPlease let us know if you have any queries.
Thanks,
Rajasekar