title: How do I make the Extended WPF Toolkit ColorPicker work?
body: <p>I would like to be able to use this color picker in my application:</p>
  
  <p><a href="http://wpftoolkit.codeplex.com/wikipage?title=ColorPicker&amp;referringTitle=Documentation">http://wpftoolkit.codeplex.com/wikipage?title=ColorPicker&amp;referringTitle=Documentation</a></p>
  
  <p>I'm using Visual Studio 2010 Ultimate with .NET 4 installed. I'm coding in C# and WPF (XAML).</p>
  
  <p>What I've done so far:</p>
  
  <ol>
  <li>Downloaded and unzipped WPFToolkit.Extended.dll</li>
  <li>Added a reference to it in Visual Studio (can I verify this somehow?)</li>
  <li>Added this line to MainWindow.xaml.cs: <em>using Xceed.Wpf.Toolkit;</em></li>
  <li><p>Added the bold line to MainWindow.xaml:</p>
  
  <p>&lt; Window x:Class="TDDD49Task2.ColorWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          <strong>xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit/"</strong> [...]></p></li>
  <li><p>Tried to use &lt; xctk:ColorPicker> in MainWindow.xaml (Error message: "<em>The type 'xctk:ColorPicker' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.</em>").</p></li>
  <li><p>Googled for a solution, tutorial or example without much success.</p></li>
  </ol>
  
  <p>Please explain how the Extended WPF Toolkit is used or point me in the right direction.</p>