title: Blur background in WPF
body: <p>I am trying to create a blur effect in WPF, but I want to blur the content located behind the control (such as a Grid), I do not intend to blur the contents of the Grid.</p>
  
  <p>I want to do something like this image.</p>
  
  <p><img src="https://i.stack.imgur.com/xwhO3.png" alt="enter image description here"></p>