title: WPF slow when TabControl bound to ViewModels
body: <p>I have <code>TabControl</code> bound directly to <code>IEnumerable&lt;ViewModelBase&gt;</code> (different ViewModels), rendered using <code>DataTemplates</code>. <b>BUT</b> when switching Tabs, one can se that <code>TabItems</code> are completely redrawed and it's soooo slow. Is it normal???</p>