it is not possible to show/hide the window from the UpdateUI event handler; refactored the code by moving control-specific parts into the derived classes (patch 1338350)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37536 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/control.h

@@ -62,6 +62,9 @@ public:
     virtual void SetLabel( const wxString &label );
     virtual bool SetFont(const wxFont& font);
 
+    // wxControl-specific processing after processing the update event
+    virtual void DoUpdateWindowUI(wxUpdateUIEvent& event);
+
     // Reserved for future use
     virtual void ReservedControlFunc1() {}
     virtual void ReservedControlFunc2() {}