Currently RadMap for WPF can't be used from the Windows Forms application. We are using application-level functionality provided by WPF in RadMap to implement caching. Unfortunately this functionality is not available in the Windows Forms applications.
We created the PITS issue to fix this problem. It will be fixed in future releases of our controls.
You can check it using our PITS system:
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items