added HasMultiplePages()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40354 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -865,6 +865,10 @@ public:
         { return DoPopupMenu(menu, x, y); }
 #endif // wxUSE_MENUS
 
+    // override this method to return true for controls having multiple pages
+    virtual bool HasMultiplePages() const { return false; }
+
+
     // scrollbars
     // ----------