title: How to put a validation process before the cell get updated?
body: <p>I am using xamdatagrid, want to have a column to remove the record which is a checkbox.</p>
  
  <p>When user click on the checkbox, there would be a pop-up asking conformation.
  But if user say no, the data should not be updated...
  So kind of put a logic the CellUpdating(EditModeStart/EditModeEnd)</p>
  
  <p>But cant find a way to terminate the update process, please help~</p>