final TabView tb = Y.newTabView(TabViewConfig.create(tabConfig));
tb.render(tbEl);
// now render the panel
PanelConfig panelConfig = (PanelConfig) PanelConfig.create().centered(true).srcNode(panelEl).width("80%").height("450px");
panelConfig.headerContent("Example Sources");
panelConfig.bodyContent(tbEl);
final Panel panel1 = Y.newPanel(panelConfig);
// panel1.contentBox().setY(0);
panel1.render();