title: Missing "Bitmap" namespace in C# WPF project
body: <p>I need to use "Bitmap" from  namespace "System.Drawing" but there is nothing like this . If I create "Windows forms Application" there is not a problem like this.</p>
  
  <p>How to use this "Bitmap" in my WPF project (add namespace that contains Bitmap class)?
  I use Microsoft Visual Studio 2015 RC.</p>