Window does not always open/close when icon is clicked

Reproduced with the example app, menubar from git checkout (a6afe2e) on Mac OS X 10.10.5.

The window does not always open or close when the icon in the menu bar is clicked. Sometimes it takes 5 or 6 clicks before the window responds. I also noticed that the icon doesn't stay highlighted when the window is open, where other menu bar apps keep the icon highlighted.