title: Visual Studio design view contains yellow warning icons?
body: <p>I have created a WPF project in Visual Studio which contains a <code>MainWindow</code>. This &quot;imports&quot; other user controls via XAML. The <code>MainWindow</code> is shown with warning icons and the following text. Unfortunately I don't have the English translation but it means something like this:</p>
  <blockquote>
  <p>This document contains one or more controls which have been changed.
  Rebuild the project to show the changes in the design view.</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/ciwlL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ciwlL.png" alt="enter image description here" /></a></p>
  <p>Rebuilding the complete solution does not help. However these warnings do not have any effect.</p>
  <p>How can I get rid of these warnings?</p>