build 20081007

If the use case element has extension point, creating a relationship to another element will have the extension point
selected instead of the relationship being selected.

- create and name a use case element on the diagram
- add a couple of extension points to the use case element
- select the use case element to display the context palette
- drag any relationship icon to an empty diagram area
result: a new use case element is created with the selected relationship link created from the originating use case to
the newly created use case. the last or second extension point is selected from the originating use case. It should be
the relationship link that is selected.