Description of problem:
Sometimes the Optional Packages button doesn't enable correctly.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Start pirut
2. Select 'Languages'
3. Select 'Thai Support'
4. Optional packages button does not appear active.
5. Mouse over 'Optional packages' button
6. Hey, it's active now!
Made it a little bit more clear that it's doing stuff here.