Topic Role Constraint Role Selector Drop Down allows manual text entry

What steps will reproduce the problem?
1. Create a new association with players in the Domain Diagram
2. Select the player role of the association, you will be displayed the topic 
role constraint tab in the property details view
3. Try to enter text in the role drop down field

What is the expected output?
You should not be able to enter text in this field as this is a field that 
chooses from available roles that have been set with association role 
constraints. In a new association there are not association role constraints 
set, the drop down list is empty and entering text manually here will not 
produce a new role or association role constraint.
Entering text should not be allowed or a warning to create an association role 
constraint first should be displayed and the text deleted.

What do you see instead?
You can manually enter text in the drop down box.

What version of the product are you using?
20101118 x64 beta

On what operating system?
10.6.4

Please provide any additional information below.

Original issue reported on code.google.com by morten.k...@whu.edu on 19 Nov 2010 at 9:36

hannesN / onotoa

Topic Role Constraint Role Selector Drop Down allows manual text entry #201