Hi,

NetDiagram doesn't support connecting arrows to other arrows. Instead, you could create one or more Transparent boxes and use the AttachTo method to attach them to the line connecting the parents. Then create arrows between these boxes and the child ones.

You can handle the TreeExpanded event as shown in the OrgBrowser example and request the blood relatives from a service running on the server. Another option is to load the whole tree and just show or hide the nodes when necessary.

I think ASP.NET Ajax will let you return a dataset from a web service method and generate a JavaScript object through which you can access the data. If that does not work, you can use the dataset's GetXml method and return an XML document to the client. One of the examples here returns an XML document from the server and parses it on the client side:

http://ajax.asp.net/docs/tutorials/ConsumingWebServicesWithAJAXTutorial.aspx

You can drag the view without using scrollbars by holding ALT and dragging with the mouse. Though that looks a bit jumpy, our developers will have to fix it for the release version.

I hope that helps,
Stoyan