Reimers Google Map not loading by RadAjaxManagerProxy with in a user control

[Shivam]

Hello Telerk,
            I am using two use controls GoogleMaps.ascx and GMaps.ascx.The GMaps.ascx is inside the GoogleMaps.ascx.I am using a RadListbox on 
GoogleMaps.ascx to load the map on GMaps.ascx.Everything was working fine but my client requested to ajaxify the RadListBox so I have added a 
RadAjaxManagerProxy to the GoogleMaps.ascx.But after adding this my map is not showing if i added another control below or upper to the map that is
working fine but map still not showing(ResponseScript not coming) please suggest ASAP.......
Here is my code.....
GoogleMaps.ascx-:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="GoogleMaps.ascx.cs"

    Inherits="BSL.TaylorWimpey.SMTS.Web.Assets.Controls.Mapping.GoogleMaps" %>

<%@ Register Src="~/Assets/Controls/Mapping/GMaps.ascx" TagName="GMaps" TagPrefix="uc1" %>

 

 

<telerik:RadAjaxManagerProxy ID="AjaxManagerProxy1" runat="server" >

    <AjaxSettings>

        <telerik:AjaxSetting AjaxControlID="radListBoxSites">

            <UpdatedControls>

                <telerik:AjaxUpdatedControl ControlID="panel1" LoadingPanelID="RadAjaxLoadingPanel1"  />

            </UpdatedControls>

        </telerik:AjaxSetting>

    </AjaxSettings>

</telerik:RadAjaxManagerProxy>

   <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server"></telerik:RadAjaxLoadingPanel>

 <div id="mapSitename">

       <telerik:RadListBox  ID="radListBoxSites" runat="server" DataTextField="Name" AutoPostBack="true"

            DataValueField="SiteID" Height="219" Width="150"  Font-Bold="True" OnSelectedIndexChanged="radListBoxSites_SelectedIndexChanged" >

        </telerik:RadListBox>    

</div>

<asp:Panel ID="panel1" runat="server">

    <uc1:GMaps ID="gmapSites" runat="server" Width="800" Height="370" ></uc1:GMaps>
</asp:Panel>

GMaps.ascx-:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="GMaps.ascx.cs" Inherits="BSL.TaylorWimpey.SMTS.Web.Assets.Controls.Mapping.GMaps" %>

<%@ Register Assembly="Reimers.Google.Map" Namespace="Reimers.Google.Map" TagPrefix="Reimers" %>

 

<Reimers:Map ID="mapSites" runat="server" Width="100%" Height="400px"

 OnOverlayClick="HandleOverlayClick" MapLanguage="en-GB" >

    <Center Latitude="0" Longitude="0" />

</Reimers:Map>