[Solved] Treeview +/- does not change when programatically expanding the node

[Jeanne Kornkven]

When one clicks on the +/- button of the node, the node expands and the +/- changes to -.
When I programmatically expand the node, the node expands but the +/- remains +.

How do I address the +/- button in code to get it to behave?

[Veronica]

Hi Jeanne Kornkven,

I've made a test solution to reproduce the problem. 

Using the Load On Demand functionality 5 new nodes are added each time some of the nodes is expanded. This is done in RadTreView_NodeClick event. To be able to change the icon from "+" to "-" you have to change the ExpandMode to ClientSide like in the example below:

protected void RadTreeView1_NodeClick(object sender, RadTreeNodeEventArgs e)
   {
       RadTreeNode node;
       for (int i = 0; i < 5; i++)
       {
           node = new RadTreeNode("New node " + i.ToString(), "New value");
           node.ExpandMode = TreeNodeExpandMode.ServerSideCallBack;
           e.Node.Nodes.Add(node);
       }
       e.Node.Expanded = true;
       e.Node.ExpandMode = TreeNodeExpandMode.ClientSide;
   }

You can find the full code in the attached .zip file.

Please let me know if this was helpful.

Sincerely yours,
Veronica Milcheva
the Telerik team

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[Jeanne Kornkven]

Veronica,
     Thank you , this did the trick!
Thanks ever so much!