3rd Party WPF control sets that support MVVM well?

Question

I have heard that there are issues with a lot of 3rd party WPF control being designed to enable programming by someone with a WinForms mind-set and hence not supporting MVVM well.

Is this a real issue?

Are any of the main WPF control vendors better on this?

(As often a 3rd party control set needs to be chosen before the programmers on a project are up to speed on WPF/MVVM, just getting an eval of the control sets is not enough)

Answer 1

I have used both Telerik and DeveExpress in MVVM and Telerik has by far the best support for MVVM. They provide a consistant API through out the control set as well as excelent command support. What was even more important for me was that they had great support for Prisim out of the box. Devexpress was quirky and inconsistant and offered no support for Prisim.