title: Extended WPF Toolkit - How to add reference to project?
body: <p>I am new to WPF. I want to use datetime picker. I have downloaded the "Extended WPF Toolkit - 1.9.0" from below site.</p>
  
  <p><a href="http://wpftoolkit.codeplex.com/releases/view/96972" rel="noreferrer">http://wpftoolkit.codeplex.com/releases/view/96972</a></p>
  
  <p>I have unzip file and found two dll. One is "WPFToolkit.dll" and "Xceed.Wpf.Toolkit.dll".</p>
  
  <p>Now How to add these two dll in my project? and
  How to use datetime control in my project.</p>