title: VisualStudio does not find namespace
body: <p>Well, I'd like to use a class of a namespace in my Mainwindow.xaml</p>
  <p><a href="https://i.stack.imgur.com/zbRcF.png" rel="nofollow noreferrer">Image</a></p>
  <p>As you see the namespace called <code>WPF.Tools</code></p>
  <p>Now I create a local at the top to the XAML</p>
  <pre><code>xmlns:webutil=&quot;WPF.Tools&quot;
  </code></pre>
  <p>And in the Grid I have a WebBrowser where I'd like to use a a method of the class of the namespace:</p>
  <pre><code>&lt;WebBrowser webutil:WebBrowserBehaviors.BindableSource=&quot;{Binding SelectedRSSFeed.Link}&quot;  Grid.Column=&quot;1&quot; Margin=&quot;10,10,10,10&quot; Grid.RowSpan=&quot;3&quot; Grid.Row=&quot;0&quot;/&gt;
  </code></pre>
  <p>If I hover over it it says: <code>The name &quot;WebBrowserBehaviors&quot; does not exist in the namespace &quot;WPF.Tools&quot;.</code></p>
  <p>I also added a Project Reference so I don't think this is the Problem</p>