Solved! Go to Solution.
I could display image when I set for Basic Layer Url = "http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" instead of "http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer". But why KmlLayer depends on Basic Layer?
Which ArcGIS SL version are you using?
Only the 2.3 version takes care of GroundOverlays.
Also does the file 'files/4_9.jpg' exist in the kmz file (after unzipping as you did)?
Have you looked at this blog post: http://blogs.esri.com/Dev/blogs/silverlightwpf/archive/2009/08/24/Troubleshooting-blank-layers.aspx?
Thanks for the link.
From my tests, it's working. You can test it here with the KML Viewer using the version 2.3 of the API.
Could you show your code, please.
Maybe the problem that I use localhost?
Do you have any ideas?