gdk_gc_set_subwindow( m_penGC, GDK_CLIP_BY_CHILDREN );
gdk_gc_set_subwindow( m_brushGC, GDK_CLIP_BY_CHILDREN );
gdk_gc_set_subwindow( m_textGC, GDK_CLIP_BY_CHILDREN );
gdk_gc_set_subwindow( m_penGC, GDK_CLIP_BY_CHILDREN );
gdk_gc_set_subwindow( m_brushGC, GDK_CLIP_BY_CHILDREN );
gdk_gc_set_subwindow( m_textGC, GDK_CLIP_BY_CHILDREN );