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//in Form.Load
GridDropDownGridListControlCellRenderer cr =
this.gridControl1.CellRenderers["GridListControl"] as GridDropDownGridListControlCellRenderer;
cr.ListControlPart.Grid.Properties.DisplayHorzLines = false;
cr.ListControlPart.Grid.Properties.DisplayVertLines = false;
cr.ListControlPart.Grid.Cols.Hidden[1] = true;
cr.ListControlPart.ShowColumnHeader = false;
If me.Grid(cc.RowIndex, cc.ColIndex).CellType = "GridListControl" Then
''...
''...
End if