解决uniTreeMenu不能自动出现滚动条

self.NavMenu.ClientEvents.ExtEvents.Values['beforeadd'] :='function(sender, component, index, eOpts){'
  //
  +'var tree=Ext.get(component.getId());'
  //
  + 'Ext.core.DomHelper.applyStyles(tree,"overflow-y:auto");'
  //
  +'}';