from overwriting each other when the main window is resized
2. more tweaks to MSWGetStyle() and related code, added a new, easier to use,
version of MSWCreateControl()
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14313 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775