add nodes dynamically with nodetemplates

[chp]

hi i got problem, adding new nodes dynamically.
the nodetemplates are assigned by the templateneeded event:

protected void tree_TemplateNeeded(object sender, RadTreeNodeEventArgs e)
{

    ANDNode x=new ANDNode();

    e.Node.NodeTemplate = x;

}

my root node is a dropdownlist and when i change the selected index of the ddl, new child nodes should be added to the node.
My problem is, that the selectedchangedindex event will be not performed. Do you have an idea, why it will be not performed?

public class ANDNode : ITemplate
{

    public ANDNode()
    {


    }
    public void InstantiateIn(System.Web.UI.Control container)
    {
        DropDownList ddl = new DropDownList();

        ddl.AutoPostBack = true;

        ddl.ID = "ddl"+Guid.NewGuid().ToString();
        ddl.DataBinding+=new EventHandler(ddl_DataBinding);
        ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);


        container.Controls.Add(ddl);
    }

    void  ddl_DataBinding(object sender, EventArgs e)
    {
        Global.FillExpressionItems((DropDownList)sender);
    }


    void ddl_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList ddl = (DropDownList)sender;

        RadTreeNode node = (RadTreeNode)ddl.NamingContainer;
        node.ExpandMode = TreeNodeExpandMode.ServerSide;
        node.Expanded = true;

        RadTreeNode child = new RadTreeNode();
        child.NodeTemplate = new ANDNode();
        node.Nodes.Add(child);
    }

}

[Plamen]

Hello Chp,

It is a little difficult for us to see what is causing the problem, would you please isolate it in a sample project so we can be more helpful.

Greetings,
Plamen Zdravkov
the Telerik team