title: Panel with percentage coordinates
body: <p>I would like use a panel whose children have coordinates specified as percentage of total panel's width/height. Moreover, I should be able to animate the coordinate property, for example to make a button move from 10% to 50% panel's width.</p>
  
  <p>I've made 2 attempts:</p>
  
  <ol>
  <li><p>Use a Grid and specify size as stars - this was not enough, because AFAIK by default WPF cannot animate distance properties specified by stars. I've found somewhere a custom class that enabled me to do so, it even worked, hovewer I consider that solution overly complicated an I am looking for something simpler.</p></li>
  <li><p>Use a Canvas with fixed width and height and put it inside a Viewbox - this is a simple solution, but when resizing the Viewbox the whole content of Canvas is resized too. I want the content to have fixed size.</p></li>
  </ol>
  
  <p>Is there a simple solution or should I implement my own panel (or maybe extend one of the existing ones, i.e. Canvas)?</p>
  
  <p>Cheers!</p>