redrawMinimizeButton(wgt: zul.wnd.Window, out: string[], tabindex?: number): void {
        var uuid = wgt.uuid,
            icon = wgt.$s('icon'),
            minLabel = msgzul.PANEL_MINIMIZE;
        out.push('<button id="', /*safe*/ uuid, '-min" class="', /*safe*/ icon, ' ', wgt.$s('minimize'), '"');