windows,linux,firefox 2, ie 6
When closing a tab that contains un-rendered buttons array, an error is thrown. In this example, closing the tab, without activating it first, generates an error. Adding the deferredRender:false option to the tabPanel config fixes the problem, but it defeats the purpose of config objects if their contents must be rendered even if not displayed.
This is not a problem in [2.0beta1]
item has no properties
this.el has no properties