Hi,

The events from the Diagram class are used only in the Windows Forms version of the control, which uses the same diagramming.dll assembly. In the ASP.NET MVC version, you can handle events only on the client side by setting NodeClickedScript to the name of a JavaScript function that should be called upon click, or by attaching a handler by calling diagram.addEventListener(Event.nodeClicked, function) on the client side:

diagram.addEventListener(Events.nodeClicked, onNodeClicked);

function onNodeClicked(sender, args)
{
    alert(args.getNode().getText());
} 

I hope that helps,
Stoyan