jQuery AutoComplete not working inside ASP.Net AJAX UpdatePanel

I have a user control containing a textbox with jquery autocomplete. when I put this user control inside an ajax update panel the autocomplete wont work correctly I think because of Partial PostBack that occurs. Any Idea how to solve this issue?
this is my jquery code :

$(document).ready(function () {
       $("#<%=txtSearch_File.ClientID%>").autocomplete(
      //some code here
}

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and the text box code:

<asp:TextBox ID="txtSearch_File" runat="server" Height="22px" onfocus ="Change_txtfocus(this, event)" onblur ="Change_txtfocus(this, event)"
     CssClass="textBoxStylerounded"  Width="100%" AutoPostBack="true" ></asp:TextBox>

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and the call of the user control:

<asp:UpdatePanel ID="PNL" runat="server" >
     <ContentTemplate>
                  <uc10:UC_AutoFile_rev1 ID="UC_id" runat="server" />
      </ContentTemplate>
  </asp:UpdatePanel>

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