Toolbars shouldn't have themed borders

Made it easier to switch off theme borders in wxWindow if necessary


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47972 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/tbar95.h

@@ -78,6 +78,9 @@ public:
 
     virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;
 
+    // returns true if the platform should explicitly apply a theme border
+    virtual bool CanApplyThemeBorder() const { return false; }
+
 protected:
     // common part of all ctors
     void Init();