title: How To: set A4 size in a WPF usercontrol?
body: <p>I have a custom "canvas" (MyUserControl) in WPF.</p>
  
  <p>I need to be able to set that "canvas" to the paper size (A3, A4 etc or even custom).</p>
  
  <p>How should I transform the <code>A4</code> in the <code>Width</code> and <code>Height</code> of the MyUserControl?</p>