How to change the row height of GroupDropArea in WinForms GridGroupingControl?

//Setting the Height for GroupDropAreaPanel and GroupDropArea in Form_Load. 
this.gridGroupingControl1.GroupDropPanel.Height = 40;
this.gridGroupingControl1.GridGroupDropArea.Height = 35;
 
//Hook the event in Form_Load to change the row height of the GroupDropArea.
this.gridGroupingControl1.GridGroupDropArea.Model.QueryRowHeight += Model_QueryRowHeight;
 
void Model_QueryRowHeight(object sender, GridRowColSizeEventArgs e)
{
    //Check for the row index 
    if (e.Index == 2)
    {
        e.Size = 30;
        e.Handled = true;
    }
}

'Setting the Height for GroupDropAreaPanel and GroupDropArea in Form_Load. 
Me.gridGroupingControl1.GroupDropPanel.Height = 40
Me.gridGroupingControl1.GridGroupDropArea.Height = 35
'Hook the event in Form_Load to change the row height of the GroupDropArea.
AddHandler Me.gridGroupingControl1.GridGroupDropArea.Model.QueryRowHeight, AddressOf Model_QueryRowHeight
 
Private Sub Model_QueryRowHeight(ByVal sender As Object, ByVal e As GridRowColSizeEventArgs)
  'Check for the row index 
  If e.Index = 2 Then
    e.Size = 30
    e.Handled = True
  End If
End Sub