I'm new to using the RadRichTextBox control. I want to bind it to a plain text field in our database. To get an idea as to what it's about I decided to create a new WPF project and just drag the RadRichTextBox onto the window (no database is involved). When I did, I looked at the XAML and saw the RadRichTextBox control, but under it a TxtDataProvider control. What's the TxtDataProvider for? (Yes, I've looked it up, found the definition of the class, etc., but that doesn't give me a feel for what it's there for or why I would need it.)