ZK - Tree not refreshing after data change

[carigold]

I have a problem regarding model binding with the new tree binding mechanism of ZK6.First, here's my code:Zul:\[code\]<div id="win" apply="org.zkoss.bind.BindComposer"viewModel="@id('vm') @init('mira.web.composer.PermissionDesignerModel')"style="width:98%; text-align:center;" vflex="1"><tree id="permissionTree" width="100%" model="@bind(vm.treeModel)" style="text-align:left;" vflex="2"> <treecols> <treecol label="Item" width="400px" /> <treecol label="Typ" /> <treecol label="Ausgabe" /> <treecol label="Einf