How to use ScriptManager and ToolKitScriptManager in same web page in ASP.Net

 <asp:ScriptManager ID="ScriptManager1"  runat="server"></asp:ScriptManager>

i am using this with update panel it works fine.

Now i have added modal popup. Used ajax 15.1 toolkit.

(they said it doesnt require ajax script manager now.)

When i use it without ajaxscript manager  it doesnt work. But when i use ajaxscript manager it works. But then i cant use scriptmanager (as two instance cant run).If i dont use script manager update panel wont work. Also i dont dont have any master page.

 <cc1:ModalPopupExtender ID="mp1" runat="server" PopupControlID="Panel1" TargetControlID="btnShow"
                            CancelControlID="btnClose" BackgroundCssClass="modalBackground">
                        </cc1:ModalPopupExtender>

      <cc1:ToolkitScriptManager ID="tksc" runat="server"></cc1:ToolkitScriptManager>