added 3 tree views in my master page,but they r not visible

Question

I added 3 tree views in my master page, i want them to show them based on different conditions, but they are not visible on other pages.

Code:

    Dim TreeView1 As System.Web.UI.WebControls.TreeView = New TreeView
    Dim TreeView2 As System.Web.UI.WebControls.TreeView = New TreeView
    Dim TreeView3 As System.Web.UI.WebControls.TreeView = New TreeView
    Dim str As String = HttpContext.Current.Profile.GetPropertyValue("UserType")
    Select Case (str)
        Case "Faculty"
            Response.Write("Faculty")
            TreeView1.Visible = True
            Exit Select
        Case "Admin"
            Response.Write("Admin")
            TreeView2.Visible = True
            Exit Select
        Case "Student"
            Response.Write("Student")
            TreeView3.Visible = True
            Exit Select
    End Select

Please let me know how to resolve this problem.

Answer 1

Call Controls.Add(TreeView1).

If this doesn't help, please provide more detail.