protected override void OnBeforeSave(MicroFour.StrataFrame.Data.BeforeSaveUndoEventArgs e)
{
    if (this.EditingState == BusinessEditingState.Adding)
    {
         if (this.custno.hasChanged)
         {
              // do something
         }
         else
         {
              // do something else
         }  
    }
    base.OnBeforeSave(e);
}