Custom Control Wheel UI

Hi all!

Has anyone had experience with designing a custom WPF UI that involved a rotating image as a control?

Basically, I need to have a round image on the screen that can rotate by clicking on the edge and dragging it. This will eventually be put on a touch screen PC so the user can rotate it via finger. Not only do I need it to rotate in this method, I need to also receive a value based on what angle it has changed to.

Can anyone point me in the right direction to a solution or tutorial?

Thanks!