facing issue when pass date value from .aspx to .ascx

thanks in advance

facing an issue while getting raddatepicker value from my parent page to .ascx control in same page

below are my html, how can i get radDate value in my APView.ascx page in order for me to validate some fields

abc.aspx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="abc.ascx.cs" Inherits="WebUserControls_abc" %>

<%@ Register Src="../APView.ascx" TagName="APView"

TagPrefix="view" %>

<telerik:RadScriptBlock runat="server">

<script type="text/javascript">

</script>

</telerik:RadScriptBlock>

<fieldset>

<legend class="mainTitle">

<asp:Label ID="lblFormHeader" runat="server"></asp:Label>

</legend>

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

SkinID="RadAjaxLoadingPanel">

</telerik:RadAjaxLoadingPanel>

<telerik:RadAjaxPanel ID="RadAjaxPanel5" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">

<table width="900px" cellpadding="2" cellspacing="2" border="0">

<tr>

<td class="caption">

Effective Date

</td>

<td>

<asp:Label ID="Label1" runat="server"></asp:Label>

<telerik:RadDatePicker ID="radDate" runat="server" SkinID="calendarrange">

<Calendar UseRowHeadersAsSelectors="False" UseColumnHeadersAsSelectors="False" ViewSelectorText="x">

</Calendar>

<DateInput EmptyMessage="FROM">

</DateInput>

<DatePopupButton ImageUrl="" HoverImageUrl=""></DatePopupButton>

</telerik:RadDatePicker>

</fieldset>

APView.ascx

telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">

<script type="text/javascript">

var datePicker = $find("[id$=_ radDate]");

alert('FromDate:' + datePicker);

</script>

</telerik:RadScriptBlock>