I added a custom section in umbraco admin side and its showing the node twice.

 

Here is my assembly code:

 

 

namespace MyCustomAssemblyGallery

{

    /// <summary>

    /// Summary description for GalleryHandlers

    /// </summary>

    public class GalleryHandlers : BaseTree

    {

        public GalleryHandlers(string application)

            : base(application)

        { }

 

        protected override void CreateRootNode(ref XmlTreeNode rootNode)

        {

            rootNode.Icon = FolderIcon;

            rootNode.OpenIcon = FolderIconOpen;

            rootNode.NodeType = "init" + TreeAlias;

            rootNode.NodeID = "init";

        }

 

        public override void Render(ref XmlTree Tree)

        {

            // Create tree node to allow viewing previously sent newsletters

            var GalCat = XmlTreeNode.Create(this);

            GalCat.NodeID = "uniqueMngCat";

            GalCat.Text = "Manage Category";

            GalCat.Icon = "docPic.gif";

            GalCat.Action = "javascript:openGalleryCategory()";

            GalCat.Menu = null;

            // Add the node to the tree

            Tree.Add(GalCat);

 

 

            // Create tree node to allow viewing previously sent newsletters

            var GalAlbum = XmlTreeNode.Create(this);

            GalAlbum.NodeID = "uniqueMngAlbums";

            GalAlbum.Text = "Manage Albums";

            GalAlbum.Icon = "docPic.gif";

            GalAlbum.Action = "javascript:openGalleryAlbums()";

            GalAlbum.Menu = null;

            // Add the node to the tree

            Tree.Add(GalAlbum);

 

            // Create tree node to allow viewing previously sent newsletters

            var GalPhoto = XmlTreeNode.Create(this);

            GalPhoto.NodeID = "uniqueMngPhotos";

            GalPhoto.Text = "Manage Photos";

            GalPhoto.Icon = "docPic.gif";

            GalPhoto.Action = "javascript:openGalleryPhotos()";

            GalPhoto.Menu = null;

            // Add the node to the tree

            Tree.Add(GalPhoto);

        }

 

        public override void RenderJS(ref StringBuilder Javascript)

        {

            Javascript.Append(@"

                function openGalleryCategory() {

                    parent.right.document.location.href = 'gallery/Category-list.aspx';

                }

");

 

 

            Javascript.Append(@"

                function openGalleryAlbums() {

                    parent.right.document.location.href = 'gallery/Gallery-list.aspx';

                }

");

 

            Javascript.Append(@"

                function openGalleryPhotos() {

                    parent.right.document.location.href = 'gallery/GalleryPhotos-list.aspx';

                }

");

 

        }

 

    }

}