Unable to get value of the property 'ajaxRequestWithTarget'

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ASP.NET

Telerik

Hi all,
I am trying to call ajaxRequestWithTarget on a telerik radajaxpanel like this:

<%= radajaxpanel.ClientID %>.ajaxRequestWithTarget('<%= radajaxpanel.UniqueID %>', eventArgs.get_item().get_value() + '|' + ID + '|' + isDelete);                    

and getting this error:

Microsoft JScript runtime error: Unable to get value of the property 'ajaxRequestWithTarget': object is null or undefined

I tried to change the code to

var ajaxManager = $find("<%= RadAjaxManager1.ClientID %>");

ajaxManager.ajaxRequestWithTarget('<%= radajaxpanel.UniqueID %>', eventArgs.get_item().get_value() + '|' + ID + '|' + isDelete);

and Its working. But I want to use ajaxRequestWithTarget with ajaxPanel.

I am wondering if anyone came across this issue before. Thanks in advance.