Hello, I'm trying to add a custom tray icon for a backoffice. My project is in VB and I followed this tutorial:

http://www.geckonewmedia.com/blog/2009/8/3/how-to-create-a-custom-section-in-umbraco-4

The problem is: I successfully added the Backoffice icon to the tray, but when I click on it no nodes are added for the .aspx page I created. Here's the code I used:

Imports umbraco.cms.presentation.Trees
Imports System.Text

Public Class CustomTree
    Inherits BaseTree

    Public Sub New(ByVal application As String)
        MyBase.New(application)
    End Sub

    Protected Overrides Sub CreateRootNode(ByRef rootNode As XmlTreeNode)
        rootNode.Icon = FolderIcon
        rootNode.OpenIcon = FolderIconOpen
        rootNode.NodeType = ("init" & MyBase.TreeAlias)
        rootNode.NodeID = "init"
    End Sub

    Public Overrides Sub Render(ByRef tree As XmlTree)
        Dim newNode As XmlTreeNode

        ' Create tree node to allow sending a newsletter
        newNode = XmlTreeNode.Create(Me)
        newNode.Text = "Polls"
        newNode.Icon = "statistik.gif"
        newNode.Action = "javascript:openPolls()"
        ' Add the node to the tree
        tree.Add(newNode)
    End Sub

    Public Overrides Sub RenderJS(ByRef javascript As StringBuilder)
        javascript.Append("function openPolls() { parent.right.document.location.href = '/backend/PollsList.aspx'; } ")
    End Sub

End Class

I added the following values to the UmbracoApp table: 

sortOrder: 9
appAlias: backoffice
appIcon: backoffice.gif
appName: Backoffice
appInitWithTreeAlias: NULL

And to the UmbracoAppTree:

treeSilent: False
treeInitialize: True
treeSortOrder: 0
appAlias: backoffice
treeAlias: backoffice
treeTitle: Backoffice
treeIconClosed: folder.gif
treeIconOpen: folder_o.gif
treeHandlerAssembly: Project.Umbraco.backend
treeHandlerType: CustomTree
action: NULL

Gave permission to the user to see the "backoffice" icon on the tray. I can see the icon but when I click on it only the node "Backoffice" is visible but I have no node "Polls". What can be the problem here?

Thanks in advance