title: WPF Style Reuse
body: <p>I am relatively new to the WPF scene, and am having a problem understanding how styles are reused amongst controls.</p>
  
  <p>My example situation is this, I'm making a control that needs a Toggle button. I want this ToggleButton to look like the 'expand' Button on a TreeViewItem. How would apply the TreeViewItem's button style to my own button?</p>
  
  <p>From my searching I have a feeling that it isn't possible without copying XAML, but I can't justify to myself why anyone would make a UI framework that limited. </p>
  
  <p>Thanks in advance.</p>