In javascript get focus on control inside FormView within InsertItemTemplate within Table? -

i believe title says all. how focus on control inside formview within insertitemtemplate within table javascript?

the asp code looks this

<asp:panel ...>  <asp:updatepanel ...>   <contenttemplate>    <asp:sqldatasource ...>      <asp:formview id=formview1 ...>        <inseritemtemplate>          <asp:table id=tblins ...>            <asp:textbox id=txtinsmybox ....>            </asp:textbox>          </asp:table>       </inseritemtemplate>        <edititemtemplate>          <asp:table id=tblupd ...>            <asp:textbox id=txtupdmybox ....>            </asp:textbox>          </asp:table>       </edititemtemplate>      </asp:formview>      <asp:validationsummary />     <div>     <asp:button id="btnsave" .../>     <asp:button id="btncancel" .../>     </div>   </contenttemplate>  </asp:updatepanel> </asp:panel> 

and javascript code in header looks this:

<script type="text/javascript">      function regainfocus() {           //this works           window.parent.document.getelementbyid("btnsave").focus();           //this works           window.parent.document.getelementbyid("formview1").focus();            //this not work           window.parent.document.getelementbyid('<%#formview1.findcontrol("txtinsmybox").clientid%>').focus();      } </script>  

i have tried changing tag "#" "=" sign , made not difference. have tried find other different controls inside formview no success.

can shed light on how findcontrol of object inside table inside formview?