Finding a control inside listview

I have a listview like this:

<asp:ListView ID="lvSubscription" 
 ....
    <ItemTemplate>
         <td style="text-align:center" width="295" >
             [b] <telerik:RadTreeView ID="RadTreeView1"  runat="server">
               
              </telerik:RadTreeView>[/b]
          </td>
    </ItemTemplate>
</asp:ListView>

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How can I find that listview when in page_load? This gives me null. Is this because when the page loads, the listview is not created yet??

  if (!Page.IsPostBack)
     RadTreeView tv = (RadTreeView)lvSubscription.FindControl("RadTreeView1");

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