Click the button many times will cause first tab add header repeatly.(only happens in accordion mold)
<zk>
<window title="new page title" border="normal">
<tabbox mold="accordion" id="tabBoxAdd">
<tabs id="tabsAdd">
</tabs>
<tabpanels id="tabpanelsAdd">
</tabpanels>
</tabbox>
<button label="add" onClick='add()'></button>
<zscript>
void add()

{ Tab tab = new Tab("new"); tabsAdd.appendChild(tab); Tabpanel tabpanel = new Tabpanel(); tabpanelsAdd.appendChild(tabpanel); }

</zscript>
</window>
</zk>