Build: Gavotte nightly build 070109_12. (Note: This bug can be find in
Enterprise Pack 5.5 as well.)

Steps to reproduce it:

1. Create TRS sample app.
2. Open TravelReservationService.bpel in BPEL Editor Design view.
3. In the BPEL diagram, Edit ReserveAirline Invoke element.
4. In the Properties Editor window, click "Create" button next to the "Input
Variable" field.
5. In New Input Variable window, change the name to "newReserveAirlineIn123".
Click Ok button.
6. In the Navigator window, under Variables node, will see
"newReserveAirlineIn123" is added.
7. Click Cancel button to close the Properties Editor window. 
   In the Navigator window, can still see "newReserveAirlineIn123" variable.
   In Bpel Editor Source view, will see source code is changed, even I click
Cancel button. This is not right.