I am currently  using infragistics v.6.3.  I have a data bound web grid where I am using a RangeValidator for a specific column to verify that the input value is positive.  The issue is that I want all cells in the grid with invalid data to be highlighted red.  I am not sure if this should be a SelectedCellChange event or UpdateCell event.  If someone could post some sample code how to achieve this behaviour it would be much appreciated.