Grouping grid row selection and context menus

Hi, I have a grouping grid, what I want to do is select a number of rows and right click to perform an operation on those rows. I can select multiple rows using shift or ctrl, but when I right click to display the context menu, I lose my multiple selection. It appears that the right click actually clicks the cell that it is currently over. How can I overcome this?

Try setting this property. this.gridGroupingControl1.TableModel.Options.SelectCellsMouseButtonsMask = MouseButtons.Left;