by implementing a toolbar class that uses native buttons.
Ultimately this should allow wxToolbook and wxPropertySheetDialog
classes to look native, when we complete the button API improvements
to combine text, bitmaps and toggling.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38703 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775