Hello JP van der Merwe,
You can read about the currently supported providers by the RadMap control in the Providers overview
help article . I'm not sure what your exact scenario is, but you could use the Empty provider
in combination with a shape file
If this is not an option for you, since the empty provider doesn't show any map tiles and it just provides spatial reference (projection) for other operations (i.e. show KML or ESRI shape files) and the ECW files are not yet supported by the RadMap control, you should probably implement a custom provider
in order to change the default URI RadMap uses to download map images. Basically, you create a custom provider and a custom MapTileSource. More about that matter, you can find in this forum thread
or in this Silverlight blog post
If you have further questions, do not hesitate to contact us again.
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