Me contesto a mí mismo 
Protected Sub TreeView1_TreeNodeDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.TreeNodeEventArgs) _
Handles TreeView1.TreeNodeDataBound
Dim Uri As New Uri(Context.Request.Url.ToString())
e.Node.NavigateUrl += Uri.Query
End Sub
Espero q le sirva a alguien!