Autocomplete/Suggestion Boxes lose focus

The main reason the suggestion boxes are "flickering" under *nix (and presumably mac) is, that wx.TextCtrl instantly loses focus.

Attached code solves this problem, but on my box I now have to click twice in the textfield... which is probably better than not having it at all - somehow the wx.TextCtrl gets focus, but not KeyboardFocus (and yes, I also tried .SetFocusKbd() - doesn't work unfortunately).