Use a GtkVBox to do TLW layout. Rework some of the remaining sizing code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/popupwin.h

@@ -25,20 +25,15 @@ public:
         { (void)Create(parent, flags); }
     bool Create(wxWindow *parent, int flags = wxBORDER_NONE);
 
-    virtual bool Show( bool show = TRUE );
+    virtual bool Show(bool show = true);
 
     // implementation
     // --------------
 
-    virtual void OnInternalIdle();
-    
     // GTK time when connecting to button_press signal
     wxUint32  m_time;
 
-
 protected:
-    void GtkOnSize();
-
     virtual void DoSetSize(int x, int y,
                            int width, int height,
                            int sizeFlags = wxSIZE_AUTO);
@@ -46,9 +41,9 @@ protected:
     virtual void DoMoveWindow(int x, int y, int width, int height);
 
 private:
-    bool m_sizeSet;
-
+#ifdef __WXUNIVERSAL__
     DECLARE_EVENT_TABLE()
+#endif
     DECLARE_DYNAMIC_CLASS(wxPopupWindow)
 };