ArcGIS API for Silverlight - Interactive Samples | ArcGIS for Developers
I have seen sample code in this link this child windows work on Webmaps, however I can't apply child pop-up windows in the maps service in arcgis for server, maybe I don't understand code in this page. So that how I can use child windows to show pop-up with services in arcgis for server. Moreover, how can I store and load Images in child windows. I have search on internet but I don't have the answer that I want. Thank for reading
Check the Info Window Sample, you can customize the content via ContentTemplate property.