Hi Figueiredorj,
Unfortunately the map control does not have a built-in baloon for MapPinPoint or other elements. However the map control allows you to place any framework element on it. Also you can use binding and item template to assign points to map. Please take a look at the following example which implements elements like baloon:
http://demos.telerik.com/silverlight/#Map/DataBinding
Greetings,
Andrey Murzov
the Telerik team
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