fix a crash when dismissing the popup window because of a key press

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13807 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/popupwin.h

@@ -107,9 +107,14 @@ protected:
     // the window which has the focus while we're shown
     wxWindow *m_focus;
 
+    // these classes may call our DismissAndNotify()
     friend class wxPopupWindowHandler;
     friend class wxPopupFocusHandler;
 
+    // the handlers we created, may be NULL (if not, must be deleted)
+    wxPopupWindowHandler *m_handlerPopup;
+    wxPopupFocusHandler  *m_handlerFocus;
+
     DECLARE_DYNAMIC_CLASS(wxPopupTransientWindow)
 };