title: Merge Rich Text?
body: <p>I have an application which involves building rich text character by character in order to undo it all at once. In order to retain that character's formatting, I select it and then can add the SelectedRtf property to my StringBuilder, however I want to be able to build each Rich Text character into one Rich Text string so that I can undo it in one go.</p>
  
  <p>My question is how can you combine Rich Text strings into one big string while retaining all the formatting for each character.</p>