1. wxStaticBox doesn't draw over the underlying controls any more

2. a couple of new helper functions in msw/private.h: wxColourToRGB and
   wxRGBToColour are handy to avoid writing horribly long and ugly RGB <-> wxColour
   conversions explicitly
3. modified wxDirDialog to be more comprehensible (to me), hopefully it also
   works better


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4468 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/control.h

@@ -76,8 +76,8 @@ protected:
    bool MSWCreateControl(const wxChar *classname, WXDWORD style);
 
    // determine the extended styles combination for this window (may slightly
-   // modify styl parameter)
-   WXDWORD GetExStyle(WXDWORD& style) const;
+   // modify style parameter, this is why it's non const)
+   WXDWORD GetExStyle(WXDWORD& style, bool *want3D) const;
 
 private:
    DECLARE_EVENT_TABLE()