title: Richtextbox.Document property not defined
body: <p>in a vain attempt to display formatted text and links in a windows form, I've tried to use a RichTextBox and insert formatted text into it through <code>MyRTB.Document;</code> (I'm using the <a href="http://msdn.microsoft.com/en-us/library/ee681613%28v=vs.95%29.aspx" rel="nofollow">RichTextBox Overview</a> from MSDN) however, when I tried to use the project, I've found that the Document property is not defined for RichTextBox. I've added the presentationframework.dll assembly and added the <code>using System.Windows.Controls</code> as stated on the <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.richtextbox.document.aspx" rel="nofollow">property documentation</a> and still no dice. I have no idea why this is happening or how to make it work, any help at all will be appriciated.</p>