Checkboxlist inside updatepanel isn't working




Hello
Am attempting to display another control on the basis of the selected item from the checkboxlist control.So am using updatepanel for doing asynchrounous postback.But it fires the event and not displaying the control.



<
asp:Panel
ID="pnlCategories"
runat="server"
>
<div
style="border:
1px
outset
blue;
width:
275px;"
>
<asp:UpdatePanel
ID="UpdatePanel1"
runat="server"
UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButtonList
ID="rdlDenialReason"
runat="server"
RepeatDirection="Vertical"
onselectedindexchanged="rdlDenialReason_SelectedIndexChanged"
AutoPostBack="True"
>
<asp:Listitem
Text="Approved, Implement Within Allocation">asp:Listitem>
<asp:Listitem
Text="Approved, On Hold">asp:Listitem>
<asp:Listitem
Text="Approved, Submit for Merit-Based Review">asp:Listitem>
<asp:Listitem
Text="Needs Revision, Return to program Officer">asp:Listitem>
<asp:Listitem
Text="Denied">asp:Listitem>
asp:RadioButtonList>
ContentTemplate>
<Triggers><asp:AsyncPostBackTrigger
ControlID="rdlDenialReason"
EventName
="SelectedIndexChanged"
>
Triggers>
asp:UpdatePanel>
div>
asp:Panel>

protected
void rdlDenialReason_SelectedIndexChanged(Object sender,
EventArgs e) Response.Write("firing");if (rdlDenialReason.SelectedIndex ==4)
{
lblDenialExplanation.Visible = true;
lstExplanation.Visible = true;
}
else
{
lblDenialExplanation.Visible = false;
lstExplanation.Visible = false;
}

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