To allow grouping at runtime, the GridGroupingControl displays a drop panel onto to which the user can drag and drop the column header. To display this drop panel, set the property ShowGroupDropArea.
The ShowGroupDropArea property controls whether or not the GroupDropArea is visible. When the GroupDropArea is visible, user can control the columns that are used for grouping by dragging grid column headers onto the GroupDropArea. The drop panel will not be shown when this property is set as false. Please refer the below code snippet which illustrates this:
this.GridGroupingControl1.ShowGroupDropArea = false;
Me.GridGroupingControl1.ShowGroupDropArea = False
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