title: The type toolkit:BusyIndicator was not found
body: <p>I'm working on a WPF project with the beginning of a UserControl defined as:</p>
  
  <pre><code>&lt;UserControl x:Class=""
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:converters="clr-namespace:.Modules.Converters"
           xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit/extended"
           mc:Ignorable="d"&gt;
  </code></pre>
  
  <p>Within the user control I have this:</p>
  
  <pre><code>&lt;toolkit:BusyIndicator IsBusy="{Binding IsBusy}" BusyContent="Please wait..."&gt;
  </code></pre>
  
  <p>I have the WPFToolkit.Extended referenced within my project and that reference appears to be valid (does not have a red underline).</p>
  
  <p>However, I'm getting this error and don't know why:</p>
  
  <p>The type 'toolkit:BusyIndicator' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.  </p>
  
  <p>Any ideas?</p>