I’m apologize, but I’m not sure I know what you mean when say that you don’t know when a load operation has been completed. The implementation of the IMapDynamicSource is a completely your own. So you have total control on it. You always know when data arrive from your data source (WCF or something else). You can store your data elements locally and then use them to draw a MapPolyLine.
As for the making the methods of the DynamicLayer protected – it is really not good idea. It can make control really unstable. We always do our best to help customers to implement requested scenarios in the most consistent way. If you need some new events –let us to know what events you need and what data should come in the event arguments. We will find the best way to implement them in the architecture of our control.
the Telerik team
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