make GTKNeedsParent() private

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73310 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/menu.h

@@ -41,10 +41,6 @@ public:
     void SetLayoutDirection(wxLayoutDirection dir);
     wxLayoutDirection GetLayoutDirection() const;
 
-    // wxMenuBar is not a top level window but it still doesn't need a parent
-    // window
-    virtual bool GTKNeedsParent() const { return false; }
-
     virtual void Attach(wxFrame *frame);
     virtual void Detach();
 
@@ -54,6 +50,10 @@ private:
 
     void Init(size_t n, wxMenu *menus[], const wxString titles[], long style);
 
+    // wxMenuBar is not a top level window but it still doesn't need a parent
+    // window
+    virtual bool GTKNeedsParent() const { return false; }
+
     GtkWidget* m_menubar;
 
     DECLARE_DYNAMIC_CLASS(wxMenuBar)