Fixes deactivation problem in last submenu.
Fixes deactivation problem in last submenu.

thomasjm/MathJax,thomasjm/MathJax,GerHobbelt/MathJax,wikimedia/MathJax,dpvc/MathJax,jinntrance/mathjax,jinntrance/mathjax,thomasjm/MathJax,thomasjm/MathJax,GerHobbelt/MathJax,thomasjm/MathJax