Module wx.lib.buttons
This module implements various forms of generic buttons, meaning that
they are not built on native controls but are self-drawn.
The GenButton is the base. It acts like a normal button but you
are able to better control how it looks, bevel width, colours, etc.
GenBitmapButton is a button with one or more bitmaps that show
the various states the button can be in.
GenToggleButton stays depressed when clicked, until clicked again.
GenBitmapToggleButton the same but with bitmaps.