//The code will generate RadTreeNode. The node has multiple subnodes.



EntityCollection<MusicEntity> collection = GetMusicData();

            EntityCollection<MusicEntity> collection = GetMusicData();

    treMusic.Nodes.Clear();

    ArrayList ptnodes = new ArrayList();


    RadTreeNode nodeWorkplane = new RadTreeNode(p.PWork);
    RadTreeNode nodeUser = new RadTreeNode(p.UserProject.Items[0].UserName);

    RadTreeNode musicgroupnode = new RadTreeNode(p.MusicSubGroup.MusicGroup.Name, String.Empty);
    RadTreeNode musicsubgroupnode = new RadTreeNode(p.MusicSSubGroup.Name, String.Empty);
    RadTreeNode musicnode = new RadTreeNode(p.MusicTitle);
    musicsubgroupnode.Nodes.Add(musicnode);
    musicgroupnode.Nodes.Add(musicsubgroupnode);


    nodeUser.Nodes.Add(musicgroupnode);
    nodeUser.Nodes.Add(nodeWorkplane);


    pgnodes.Add(nodeUser);

foreach (RadTreeNode pg in ptnodes) 
    {
        treMusic.Nodes.Add(pg);

    }

From the code above, this is treenode that will display.

User1
  -> Music Group node 1
    -> Music SubGroup node 1
         -> Music Node 1

  -> Node Workplane 1

User1
  -> Music Group node 2
     -> Music SubGroup node 2
         -> Music Node 2
   -> Node Workplane 2

My question how i can combine user1 in one node. Thank you for helps. so the following node that i want to achieve:

User1
      -> Music Group node 1
        -> Music SubGroup node 1
             -> Music Node 1


      -> Music Group node 2
         -> Music SubGroup node 2
             -> Music Node 2

      -> Node Workplane 1
      -> Node Workplane 2