Fix for disabled controls

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/combobox.h

@@ -80,6 +80,8 @@ public:
     // implementation only from now on
     virtual bool MSWCommand(WXUINT param, WXWORD id);
     bool MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam);
+    virtual WXHBRUSH OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
+            WXUINT message, WXWPARAM wParam, WXLPARAM lParam);
 
     WXHWND GetEditHWND() const;