ASP.NET - TreeView - How to remove hyperlink

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Replace
        <asp:TreeView ID="TreeView1" runat="server">
            <Nodes>
                <asp:TreeNode Text ="aaa"></asp:TreeNode>
                <asp:TreeNode Text ="bbb"></asp:TreeNode>
            </Nodes>
        </asp:TreeView>

With
        <asp:TreeView ID="TreeView1" runat="server">
            <Nodes>
                <asp:TreeNode Text ="aaa" SelectAction="None"></asp:TreeNode>
                <asp:TreeNode Text ="bbb" SelectAction="None"></asp:TreeNode>
            </Nodes>
        </asp:TreeView>