"""
There is an old (and apparently unsolvable) bug when placing a
window with a nonstandard background colour in a wx.Notebook on
- wxGTK, as the notbooks's background colour would always be used
+ wxGTK1, as the notbooks's background colour would always be used
when the window is refreshed. The solution is to place a panel in
the notbook and the coloured window on the panel, sized to cover
the panel. This simple class does that for you, just put an