title: How to suppress UI exceptions in wpf?
body: <p>I am creating design app where users can drag and drop controls to some surface.
  Some controls in toolbar can contains broken logic and generate exceptions when injected to the surface.
  I would like to suppress some unhandled exception comming from the 3rd party controls when they are dropped.</p>
  <p>I want to suppress this UI exception and show some kind of popup:</p>
  <pre><code>workArea.Dispatcher.UnhandledException += MainContainerDispatcherUnhandledException
  </code></pre>
  <p>Is is possible to handle and suppress based on the source of origin?</p>
  <p>Thanks.</p>