SQWRLTab control pane may get scrambled

[csnyulas]

Steps to reproduce:

• Select SQWRLTab
• Grab the divider between the top pane (containing the queries) and the bottom pane (containing the controls) while the "SQWRL Queries" tab is visible in the bottom pane, and pull it up
• the "SQWRL Queries" tab will get messed up (specifically the "Run" button with a stripe of gray area surrounding it will appear again, as in the below screen shot)
• Switching between tabs, both top level Protege tabs and tabs within SQWRLTab, and coming back to this tab will always show this tab messed up.

This behaviour was observed on Ubuntu.