Hi MarieQB,
Yes, you can use external source. You can load a file from internet using the WebClient class. The map control does not support kmz files directly, but you can use the following link to download the sharpziplib library:
http://slsharpziplib.codeplex.com/
The sample code of loading kmz file is below.
Best wishes,
Andrey Murzov
the Telerik team
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