I have a dataset bound to an ultragrid control.  The column is a nullable integer in Oracle.  I created a ValueList hooked to an UltraDropdown.  When the database values are null the application displays blank in the column cell which is good.  Now when I try the following code:

MyUltraGrid.ActiveCell.Value = null;

I get this message "Unable to convert from '(null)' to 'System.Decimal'.  How do I programatically set the value to NULL in a dropdown valuelist cell.  The Dropdown list does contains say 1, 2, 3, 4, 5 but no null value in the list.

The column DataType that is not changeable is "System.Decimal".  Nullable is set to Automatic.