Fix for TextCtrl problem as reported by Vegh

Move definition of wxMenuItem to /gtk/menuitem.h
  Radical change of how to insert a child into a
    paren window. As C++ doesn't have any VMT in
    a class's consructor, I have to use a callback.
  Fixed culumn resizing bug in wxListCtrl
  Fixed menu height bug in MDI code


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@955 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/dialog.cpp

@@ -98,6 +98,9 @@ bool wxDialog::Create( wxWindow *parent,
      
   gtk_widget_set_usize( m_widget, m_width, m_height );
      
+  if (m_parent) m_parent->AddChild( this );
+  
+  
   PostCreation();
   
   return TRUE;