Cannot see the tree

Hi,
I created a treeview dynamically at the page load event as below
TreeView t1 = new TreeView();
            TreeNode rootnode = new TreeNode();
            rootnode.Text = "root";
            t1.Nodes.Add(rootnode);


When I execute the application I cant see anything
Why? What am I missing.
Further I would like to add a checkbox to the treeview.
When I cant even see the tree, how will i add the checkbox
Any ideas where am i going wrong.


Regards
cmrhema

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