public override void get_preferred_width (Widget widget,
                        out int      min_width,
                        out int      nat_width) {


        int xpad=0;


        TreeView tree = widget as TreeView;
        TreeViewColumn column = tree.get_column(0);

        default_width = column.width;
        nat_width = min_width = column.width;
    }

    public override void get_preferred_height_for_width (Widget widget,
                               int          width,
                               out int      minimum_height,
                               out int      natural_height) {
        int a;
        Pango.Rectangle rect;
        Pango.Layout layout = widget.create_pango_layout(text);
        layout.set_width(width*Pango.SCALE);
        layout.set_wrap(Pango.WrapMode.WORD);

        layout.get_pixel_size(null, out a);

        if ( a < 100 ) {
            minimum_height = a;
            natural_height = a;
            TreeView tree = widget as TreeView;
            TreeViewColumn column = tree.get_column(0);
            column.queue_resize();
        }
        else {
            minimum_height = 100;
            natural_height = 100;
        }
        print("%d %d\n", minimum_height, natural_height);
    }

    public override void get_preferred_height (Widget widget,
                         out int      minimum_size,
                         out int      natural_size) {
        int min_width;

        get_preferred_width (widget, out min_width, null);
        get_preferred_height_for_width (widget, min_width,
                    out minimum_size, out natural_size);
        print("minimum size %d\n", minimum_size);
    }