How to allow editing for a specific row in the readonly grid in WinForms GridGroupingControl?

//Trigger event
this.gridGroupingControl1.TableControlCurrentCellStartEditing += new GridTableControlCancelEventHandler(gridGroupingControl1_TableControlCurrentCellStartEditing);
void gridGroupingControl1_TableControlCurrentCellStartEditing(object sender, GridTableControlCancelEventArgs e)
{
   GridCurrentCell cc = e.TableControl.CurrentCell;
   // Editing is allowed only for the rows in the below collection
   e.Inner.Cancel = !(list.Count > 0 && list.Contains(cc.RowIndex));
}
private void button2_Click(object sender, EventArgs e)
{
   isallowedit = !isallowedit;
   if(isallowedit)
   {
      list.Clear();
      //Selected records added to the list
      foreach(SelectedRecord record in gridGroupingControl1.Table.SelectedRecords)
      {
         list.Add(record.Record.GetRowIndex());
      }
   }
   else
      list.Clear();
      isallowedit = false;
}

'Trigger event
AddHandler gridGroupingControl1.TableControlCurrentCellStartEditing, AddressOf gridGroupingControl1_TableControlCurrentCellStartEditing
Private Sub gridGroupingControl1_TableControlCurrentCellStartEditing(ByVal sender As Object, ByVal e As GridTableControlCancelEventArgs)
   Dim cc As GridCurrentCell = e.TableControl.CurrentCell
   ' Editing is allowed only for the rows in the below collection
   e.Inner.Cancel = Not(list.Count > 0 AndAlso list.Contains(cc.RowIndex))
End Sub
Private Sub button2_Click(ByVal sender As Object, ByVal e As EventArgs)
   isallowedit = Not isallowedit
   If isallowedit Then
      list.Clear()
      'Selected records added to the list
      For Each record As SelectedRecord In gridGroupingControl1.Table.SelectedRecords
          list.Add(record.Record.GetRowIndex())
      Next record
   Else
      list.Clear()
   End If
   isallowedit = False
End Sub