Update issue #223 : Restore broken keyboard handling in Filters window

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@394 c2f33eb2-41b2-391d-4cb4-d9d0608729ba
Update issue #223 : Fix broken detection of Shift/Ctrl/Alt keys in keyboard handling

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@395 c2f33eb2-41b2-391d-4cb4-d9d0608729ba