Why do I keep getting an ArgumentNullException error whenever I click on Miscellaneous?

[Rod]

So I've dragged a RadRichTextBox onto a window, and decided to see what properties are available to me for the control, but looking at them in the Properties window in VS 2012. When I get to the point of clicking on the Miscellaneous section I get an error (please see attached). I've tried this in more than 1 new project, and it does it consistently. Why? What's going on?

I'm working with Telerik.Windows.Controls runtime version 4.0.30319. And version number: 2012.3.1017.45

[Vasil]

Hi Rod,

Thank you for your questions.

This exception has been already resolved in 2013 Q1 (2013.1.220) release of RadControls for WPF, so you could upgrade to it or later version of our controls.

I hope this information helps. Please, do not hesitate to contact us if you have any other questions.

Regards,
Vasil
the Telerik team