title: Allow control to grow, but not to shrink
body: <p>I basically have a setup like this:</p>
  
  <pre><code>&lt;GroupBox&gt;
    &lt;TextBlock Name="tbValue"/&gt;
  &lt;/GroupBox&gt;
  </code></pre>
  
  <p>The content of the TextBlock changes very often (displaying a measure value from a sensor). This leads to the width of the groupbox changing all the time which looks&amp;feels like crap.</p>
  
  <p>Does anyone have an idea how i could make the groupbox grow automatically when the text changes, but not shink again whenever the text gets shorter again?</p>