How to bind events for formsControls inside Excel

Hi,
I am developing an Excel Addin using VS2008 and VSTO3.0,On click of one of
the buttons of the ribbon it creates check boxes inside Excel.to create
checkBox i followed the following approach

Excel.Range cell = _mWorkSheet.Cells[i, 1] as Excel.Range;
Microsoft.Office.Interop.Excel.Shape shape;
// shape =
_mWorkSheet.Shapes.AddFormControl(Microsoft.Office.Interop.Excel.XlFormControl.xlDropDown,
Convert.ToInt32(cell.Left), Convert.ToInt32(cell.Top),
Convert.ToInt32(cell.Width), Convert.ToInt32(cell.Height));
shape =
_mWorkSheet.Shapes.AddFormControl(Microsoft.Office.Interop.Excel.XlFormControl.xlCheckBox,
Convert.ToInt32(cell.Left), Convert.ToInt32(cell.Top),
Convert.ToInt32(cell.Width), Convert.ToInt32(cell.Height));
shape.Name = "checkbox"+i.ToString();

Now i want to know how can i bind any event to checkboxs inside excel cell.

Thanks,
Patro