title: New Window in a TabItem?
body: <p>Is it possible to open another <code>Window</code> in a <code>TabControl</code>'s <code>TabItem</code>?</p>
  
  <p>The reason I want to do this is that if I have 5 <code>TabItem</code>s in my <code>TabControl</code>, the one Window file I'm coding all these <code>TabItem</code>s and their associated actions will get very large.  So it would be nice if it was possible to to give each <code>TabItem</code> its own <code>Window</code> file.</p>
  
  <p>Or how do you solve the problem where the<code>Window</code> file controlling the <code>TabControl</code> gets too large?</p>