don't refresh the menu if it's frozen

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39926 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/menu.cpp

@@ -847,6 +847,9 @@ wxMenuBar::~wxMenuBar()
 
 void wxMenuBar::Refresh()
 {
+    if ( IsFrozen() )
+        return;
+
     wxCHECK_RET( IsAttached(), wxT("can't refresh unattached menubar") );
 
 #if defined(WINCE_WITHOUT_COMMANDBAR)