Hi Chuck,
By calling the MessageBox.Show method with out the owner argument will solve the mentioned issue.
MessageBox.Show("My Exception Message....", "MyExceptionTitle");
But if you want to pass the owner argument compulsorily for some reason then you can pass the drop down container as the owner as mentioned below.
MessageBox.Show((this.gridGroupingControl1.TableModel.CurrentCellRenderer as GridDropDownCellRenderer).DropDownContainer,"My Exception Message....", "MyExceptionTitle");
To trigger the ExceptionRaised event in the attached sample delete the value of “InsideCategoryID” column of any row in the Child_CategoryChildName column''s drop down and press enter.
Regards,
Calvin.
CS5.zip