RadMap is included in the Telerik.Windows.Controls.DataVisualization assembly. Could you, please, refer to the attached screenshot and check if RadMap is ticked in the Choose Toolbox Items window. It appears that in some cases it is unchecked by default and this is why it is not automatically included in the toolbox.We're currently investigating this issue.
However, you should have no problems adding it manually - just by selecting it in the Choose Toolbox Items window and clicking OK.
Hope this helps. If you have further questions, do not hesitate to contact us.
the Telerik team
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system and vote to affect the priority of the items.