New answers tagged arcgis-silverlight-api
See my answer to your other very similar question for example code using the Silverlight API's GeometryService Project operation.
In Silverlight, the KMLLayer has a ProjectionService parameter that you can bind to the GeometryService. This example does something similar with a GeoRSSLayer, and it should work the same with the KMLLayer.
GIF Images are not supported by Microsoft Silverlight, which ArcGIS Explorer Online is built with. I'd suggest using a different image format like png. Check this link: http://forums.arcgis.com/threads/36424-images-in-pop-ups-are-not-shown-in-all-apis
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