You Can Disable Node Click On Parent Node On Server Side By Setting the Value of PostBack to false then handle the level for node on node click event
Example :
| RadTreeNode Node = new RadTreeNode(Node Name Here, Node Value Here) |
| Node.PostBack = false; |
| tree.Nodes.Add(Node ); |
| //And on NodeClick Event We Do The Following : |
| protected void tree_NodeClick(object sender, RadTreeNodeEventArgs e) |
| { |
| if (e.Node.Level != 0) |
| { |
| //Your Event For Click Here |
| } |
| } |