Thank you for the feedback.
We will fix this problem in some of our future releases of RadMapl. We've created a PITS issue and you can check when the fix will be available using the following link.
The map control has the built-in zoom control that uses binding to the RadMap.ZoomLevel property.
Currently, if you want to use binding, then you should disable this zoom control. The RadMap has the ZoomBarVisibility property. To hide the zoom control you should set it to "Collapsed".
If the zoom control is displayed, then you cannot use the binding to the ZoomLevel property.
All the best,
the Telerik team
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