title: Problems with webviewbrush and Rectangle
body: <p>I'm having problems hiding a webview, my application is based on a webview as I'm showing words definitions with an html format, when I need to show any settings pane or any other element over the webview I need to hide it and fill a rectangle with a webviewbrush...</p>
  
  <p>The problem is that when I do it, the rectangle shows an stretched image... I've tried using different stretch settings both for the webview brush and rectangle but can't make it look exactly like the webview...</p>
  
  <p>For example if I use stretch none on the webviewbrush.. it works under some resolutions, but on higher resolutions it shows the image bigger than it is...</p>
  
  <p>I can't seem to find a fix for this... could anybody give me a hand?</p>