title: WPF - Confusion with namespaces and "odd" errors
body: <p>I've been trying to get my head around XAML and it's namespaces and I just cannot seem to get the logics of things. For example, I'm trying to animate a gridrow's GridLength property following a tutorial. I can get the sample code to run just fine. But trying to actually port the features into my own code seems to be impossible. I always run into odd errors which doesn't occur in the source code. Animating the GridLength property isn't possible, so I need to create a new .vb file containing the code making it possible. </p>
  
  <p>But trying to actually reach what's in there I can't get to work.</p>
  
  <p>In my Window.xaml file I have this at the top:</p>
  
  <pre><code>xmlns:gridanim="clr-namespace:HDI_WPF_GridAnimation_vb"
  </code></pre>
  
  <p>Which targets a GridLengthAnimation.vb file. In that file you have this:</p>
  
  <pre><code>Imports System.Windows.Media.Animation
  Imports System.Windows
  
  Public Class GridLengthAnimation
      Inherits AnimationTimeline
  </code></pre>
  
  <p>Back in the Window.xaml, getting contact with "GridLengthAnimation" is impossible:</p>
  
  <pre><code>&lt;gridanim:GridLengthAnimation&gt;&lt;/gridanim:GridLengthAnimation&gt;
  </code></pre>
  
  <p>I get an error message saying:</p>
  
  <pre><code>The name "GridLengthAnimation" does not exist in the namespace "clr-namespace:HDI_WPF_GridAnimation_vb".
  </code></pre>
  
  <p>What is causing the issue?</p>