asp.net - Dropdown list in update panel not causing selected index changed in ie8 and ie9 -


i have dropdown list in update panel. dont cause selected index changed in ie8 , ie9.

i have tried adding postback triggers , async postback trigers in designer, , in code behind.

any ideas how fix this?

here code:

<asp:scriptmanager id="scriptmanager1" runat="server"      loadscriptsbeforeui="false" viewstatemode="enabled">      </asp:scriptmanager>  <asp:updatepanel id="otonupdatepanel" runat="server" rendermode="inline"  >   <contenttemplate> bla bka     <asp:dropdownlist id="ddlorderby" runat="server" autopostback="true" causesvalidation="false"                                                     onselectedindexchanged="ddlorderby_selectedindexchanged"                                                  viewstatemode="enabled" ontextchanged="ddlorderby_selectedindexchanged">                                                <asp:listitem>datum</asp:listitem>                                                <asp:listitem value="titel"></asp:listitem>                                                <asp:listitem>sprecher</asp:listitem>                                                </asp:dropdownlist>

and on page load:

   scriptmanager.registerasyncpostbackcontrol(this.findcontrol("ddlorderby"));


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