Fix WED View Port Display Bugs

Sometimes after building and running the game full screen from within WED (via clicking the RUN button) the view ports fail to refresh and the only way to get them working again is to shut down WED and restart. Secondly, sometimes the buttons to control a view port (full screen, minimize, window - they appear at the upper-right of each window) disappear after running the level full screen and, once again, the only way to get them back is to shut down WED and restart.