title: Error: Project file must include the .NET Framework assembly 'WindowsBase, PresentationCore, PresentationFramework' in the reference list
body: <p>I am using WPF in a Windows Forms Application with C#.</p>
  <p>Follow up of the question.
  <a href="https://stackoverflow.com/questions/10810092/adding-a-collection-of-solid-dashed-lines-pen-to-a-combo-box">Adding a collection of solid,dashed lines pen to a combo box</a></p>
  <p>Error:</p>
  <blockquote>
  <p>Project file must include the .NET Framework assembly 'WindowsBase, PresentationCore, PresentationFramework' in the reference list.</p>
  </blockquote>
  <p>Please suggest</p>