title: remove document tab shown in avalondock
body: <p>My application does not have multiple documents. So I do not need the tab shown in LayoutDocumentPane. I found that it can be customized by using style here. <a href="http://avalondock.codeplex.com/wikipage?title=Document%20tab%20restyling" rel="nofollow">http://avalondock.codeplex.com/wikipage?title=Document%20tab%20restyling</a></p>
  
  <p>But it seems to be over complicated. Is there any simple way of doing this ?</p>