How can I replicate the "Add heading" functionality of the left quick launch bar with the client side object model?
The task looks simple. Update the left bar of several sites by with a few links grouped by header like:
Link group 1
    Link 1
    Link 2
Link group 2
    Link 3
I can create the nodes and arrange them, but the "Link group x" nodes also turn into hyperlinks, even if I don't set the URL property of the NavigationNodeCreationInformation object in Sharepoint 2010, VB. How can I either create a blank group without link?
The related part of the code (removed the actual links)

    nciHead.Title = "Group 1"
    nciHome.Title = "Homepage"
    nciHead.IsExternal = True 'otherwise it fails
    nciHome.Url = "link1"
    nd = qlColl.Add(nciHead)
    nd.Children.Add(nciHome)
    nd.Update()
    context.ExecuteQuery()