See http://www.netbeans.org/servlets/ReadMsg?list=nbusers&msgNo=77365, http://www.netbeans.org/issues/show_bug.cgi?id=91602 and http://www.netbeans.org/issues/show_bug.cgi?id=93076

When there is a breakpoint in the action performer of a combo box, then when the breakpoint is hit, all X-windows ignores any mouse or keyboard input, because the suspended application grabs the focus. The only way to recover is to kill the debuggee from a console.
This happens in JDK 1.6 only, in JDK 1.5 it works fine, so it's a regression.

To reproduce:
- unzip the attached zip file ComboCrash.zip
- $ jdb
- > run debuggertest1.ComboCrash
- > stop at debuggertest1.ComboCrash:44
- then select an arbitrary item from the combo box
- the breakpoint is hit and under JDK 1.6 X-windows are frozen

See the original description at http://www.netbeans.org/issues/show_bug.cgi?id=93076