title: WPF Border shape
body: <p>I want to create a popup like the one that Lync 2013 has:</p>
  
  <p><img src="https://i.stack.imgur.com/AYGYM.png" alt="enter image description here"></p>
  
  <p>What I´m interested in, is to create a control with that vignette shape.</p>
  
  <p>I have tried creating a UserControl with a Canvas inside and a Path with the shape. But I was not finding Canvas very friendly, so I was wondering if I can achieve this by "playing" with the Border control, so as to put only a border and then a grid inside.</p>
  
  <p>Is this possible? Can somebody help me to be in the right track?</p>