Treegrid codebehind to Tab Panel

Is is possible to add a Tree Grid in code behind to a TabPanel. I am using VB and I can add a grid and all other types of objects in Tab Panel (codebehind) but I cannot add a treegrid or a treepanel. I error on debug without any real message back. It just points to the following statement when I click on the tab, after the tab is created and rendered.

Code:

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this.onRender(this.container,a||null)

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-- This happens in the ext.awd

This is not created on a Page Load, it is intended to be interactive with the user.

This syntax is close to what I used for a GridPanel which works just fine for me. It is a function that should return a TreeGrid.

Code:

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Dim tree = New TreeGrid()
        Dim column = New TreeGridColumn

        column.Header = "TEST"
        tree.Columns.Add(column)
       


        ' tree.ID = "TreePanel1"
        tree.Width = Unit.Pixel(300)
        tree.Height = Unit.Pixel(450)
        tree.Icon = Icon.BookOpen
        tree.Title = "Catalog"
        tree.AutoScroll = True
 Dim root = New TreeNode("Composers")
        root.Expanded = True
        tree.Root.Add(root)

        Make_A_Tree_Grid = tree

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Thanks for any help or pointing out anything I might have misunderstood about TreeGrid.