<asp:LoginView ID="LoginView1" runat="server">
<RoleGroups>
<asp:RoleGroup Roles="X">
<ContentTemplate>
put RoleX's TreeView here
</ContentTemplate>
</asp:RoleGroup>
<asp:RoleGroup Roles="Y">
<ContentTemplate>
put RoleY's TreeView here
</ContentTemplate>
</asp:RoleGroup>
</RoleGroups>
</asp:LoginView>