Duplicate of NIM03256 - Chnaging the primary resource of a Map through a callback will show a blank OverviewMap
対処法
Workaround:Set the name of the MapResourceItem to default (MapResourceItem0) or not set it explicitly.Remove the following statement from Default.apsx.cs:<a href="http://mapResourceInfo.Name" target="_blank">mapResourceInfo.Name</a> = "Cities_WGS84";//Replace to test: Zipcodes_NAD83Run the application again and click Callback button, the OverviewMap refreshes this time.