title: WPF TreeView Clear Selection
body: <p>How would I clear the TreeView selection within a WPF TreeView?  I have tried looping through the <code>TreeNodes</code> and clearing the <code>IsSelected</code> property, however that is a <code>ReadOnly</code> property. Any ideas?</p>
  
  <p>The <code>TreeView</code> is using XML Binding through the <code>XMLDataProvider</code> object.</p>