title: Detect mouse directly over border in WPF
body: <p>I have a simple UserControl whose direct Child element is a border:-</p>
  
  <pre><code> &lt;Border x:Name="LayoutRoot" BorderThickness="5" BorderBrush="Transparent"&gt;
      &lt;Grid&gt;...Content here...&lt;/Grid&gt;
   &lt;/Border&gt;
  </code></pre>
  
  <p>How can I detect that the mouse is over the border area, that is the 5 pixel border itself?  While the mouse is there I want to flip the border brush to another color.  When the mouse moves into the main Grid content I want to border brush to flip back.</p>