asp.net - RegisterStartupScript not working with UpdatePanel and Google Visualization charts -

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on asp.net page using google visualization charts inside of asp:updatepanel. user selects chart want see 2 asp:dropdownlists , c# code generates javascript , call scriptmanager.registerstartipscript(...). when page first loads first default chart (i.e. first call registerstartupscript) works , can view javascript view source. on postbacks blank chart , when go view source page didn't receive new javascript , still has old default javascript first page load. here weird behavior. if use exact same code replace google chart code alert(...); alert() fires every time , when view source script there. i've tried may different things , followed such answers here. below code , appreciated, i've had other people @ , stumped. fyi: if remove updatepanels , related items (scriptmanager , updateprogress) , use clientscript.registerstartupscript() works fine , new javascript code on page , new chart appears should.

<asp:scriptmanager id="scriptmgr" runat="server" />  <asp:updatepanel id="updatepaneldata" runat="server">     <contenttemplate>          <p>             <asp:dropdownlist id="plotlist" runat="server" autopostback="true" width="500px"                  onselectedindexchanged="plotlist_selectedindexchanged"></asp:dropdownlist>             <asp:dropdownlist id="rangelist" runat="server" width="125px"                  style="float:right;" autopostback="true"                  onselectedindexchanged="rangelist_selectedindexchanged">             </asp:dropdownlist>             <br />             <asp:label id="plotdescription" runat="server" width="100%"></asp:label>          </p>         <div id="chart_material" class="googlechart" style="width:100%;height:450px;"></div>     </contenttemplate>     <triggers>         <asp:asyncpostbacktrigger controlid="rangelist" eventname="selectedindexchanged" />         <asp:asyncpostbacktrigger controlid="plotlist" eventname="selectedindexchanged" />     </triggers> </asp:updatepanel>   <asp:updateprogress id="updateprogressdata" runat="server" displayafter="500">     <progresstemplate>         <div class="loadingpanel">             <asp:image id="loadingimage" runat="server" imageurl="~/images/loading_2.gif" alternatetext="loading ..." tooltip="loading ..." style="padding: 10px;position:fixed;top:45%;left:50%;" />         </div>     </progresstemplate> </asp:updateprogress>

and c# code looks this. function displayplot called 2 dropdownlist events , each list passes in 'control'.

private void displayplot(control control)     {         plotinformation plot = new plotinformation(chartdivid);          double range = convert.todouble(rangelist.selectedvalue);          string javascript = plot.getplotscript(plotlist.selecteditem.text, range);          plotdescription.text = plot.getdataplotdescription(plotlist.selecteditem.text);          //string testscript = "<script type=\"text/javascript\">\n\talert('" + plotlist.selecteditem.text + "');\n</script>";          scriptmanager.registerstartupscript(control, control.gettype(), scriptkey, javascript, false);         //scriptmanager.registerstartupscript(control, this.gettype(), scriptkey, javascript, false);          //if (!clientscript.isstartupscriptregistered(scriptkey))         //    clientscript.registerstartupscript(this.gettype(), scriptkey, javascript);     }

i know late, spent lot of time on same bug.

try changing:

scriptmanager.registerstartupscript(control, control.gettype(), scriptkey,    javascript, false);

to 

scriptmanager.registerstartupscript(updatepaneldata, updatepaneldata.gettype(), scriptkey,    javascript, false);

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