I saw this method: https://mindfusion.eu/Forum/YaBB.pl?num=1245076133/2, and I changed it work in Javascript, but the function is never called. My version below.

private void OnSelectionChanged(object sender, EventArgs e)
{
     if (!inSelChanged)
     {
           inSelChanged = true;
           while (diagram.Selection.Links.Count > 1)
                 diagram.Selection.Links[0].Selected = false;
           inSelChanged = false;
     }
}

private bool inSelChanged;


My Version:

function  onSelectionChanged(sender,args)
{
     if (!inSelChanged)
     {
           inSelChanged = true;
           while (diagram.Selection.Links.Count > 1)
                 diagram.Selection.Links[0].Selected = false;
           inSelChanged = false;
     }
}

var inSelChanged = false;

diagram.addEventListener(Events.selectionChanged, onSelectionChanged);


Javascript doesn't complain, it simply ignores the multiple item selection.  What am I missing?   Thanks