--- a/controls/DurationCellEditor.py	Sat Mar 31 13:14:53 2012 +0200
+++ b/controls/DurationCellEditor.py	Sat Mar 31 13:16:44 2012 +0200
@@ -140,7 +140,7 @@
         if changed:
             self.Table.SetValueByName(row, 'Interval', duration)
         self.CellControl.Disable()
-        return False
+        return changed
 
     def SetSize(self, rect):
         self.CellControl.SetDimensions(rect.x + 1, rect.y,