title: .Net Winform Diagram Library
body: <p>I'm looking for a library to create and manipulate diagrams. Something with the look and feel of VS DataSet or the SSMS Diagram would be perfect, but I'm not expecting that much. The features I would need would be :</p>
  
  <ul>
  <li>Creation of "Groups of item"</li>
  <li>Drag &amp; Dropping of items</li>
  <li>Creating links between items of different groups</li>
  </ul>
  
  <p>I would use this library in WinForms and I plan to code in C#, even though any .Net library would do. Ideas anyone?</p>