Add a SetDoubleBuffered method for wxMSW (XP+)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@53929 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -428,7 +428,11 @@ public:
 
     // check if a native double-buffering applies for this window
     virtual bool IsDoubleBuffered() const;
-
+    
+#if wxABI_VERSION >= 20808
+    void SetDoubleBuffered(bool on);
+#endif
+    
     // synthesize a wxEVT_LEAVE_WINDOW event and set m_mouseInWindow to false
     void GenerateMouseLeave();