Is there any way to remember the expanded/collapsed state of a diagram node when a parent of that node is collapsed?  For example, if I have A -> B -> C -> D then I collapse C, and then collapse A, when I expand A, I would like C to still be collapsed.

I was thinking about doing this manually, but when A is collapsed, is the state of C remembered?  It would be great to have an option to do this automatically.

-Ben

Thanks for the information.

I have some very simple code and already running into two problems. With the following:

        public static void diagram_ExpandButtonClicked(object sender, NodeEventArgs e)
        {
            if (e.Node.Expanded)
            {
                e.Node.Collapse();
            }
            else
            {
                e.Node.Expand();
            }
        }
 

For some reason, e.Node.Expanded always returns false. So I changed the condition to e.Node.OutgoingLinks[0].Destination.Visible instead and this works, but when I click the +/- button, the button itself changes state but nothing else happens. When I click it again, the +/- button stays the same and the node changes state. Could you explain what is going on internally?

Thanks,
Ben

I wanted to share my solution to this in case anyone is interested. It turned out to be amazingly simple! I simply don't change the expanded flag when collapsing the nodes:

        public static void diagram_ExpandButtonClicked(object sender, NodeEventArgs e)
        {
            // Note: e.Node.Expanded is set before entering this handler
            if (e.Node.Expanded)
                ExpandNode(e.Node);
            else
                CollapseNode(e.Node);
        }

        private static void CollapseNode(DiagramNode node)
        {
            foreach (DiagramLink link in node.OutgoingLinks)
            {
                link.Visible = false;
                link.Destination.Visible = false;
                CollapseNode(link.Destination);
            }
        }

        private static void ExpandNode(DiagramNode node)
        {
            foreach (DiagramLink link in node.OutgoingLinks)
            {
                link.Visible = true;
                link.Destination.Visible = true;
                if (link.Destination.Expanded)
                    ExpandNode(link.Destination);
            }
        }
 

This will only expand up to a node that was previously collapsed.

-Ben