delete the hidden TLW parent window from a module to ensure that it is done even if OnInit() returns FALSE; also create it without using wxTLW itself which actually simplifies the code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17442 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/toplevel.h

@@ -119,10 +119,6 @@ protected:
     // the last focused child: we restore focus to it on activation
     wxWindow             *m_winLastFocused;
 
-    // the hidden parent window for the frames which shouldn't appear in the
-    // taskbar
-    static wxWindow *ms_hiddenParent;
-
     DECLARE_EVENT_TABLE()
 };