-- wxNotebook and property list frame do not appear properly when
- first shown.
- Workaround: resize the window (manually or programmatically) to
- make the window appear.
- This also happens with other windows, e.g. the sizer
- dialog in the layout sample.
-
-- wxSashWindow borders aren't repainted properly if the sashtest
- sample is exposed (after being under another window).
-