Anybody faced this kind of issue before?

Hello,

Well...This is intermittent issue....I am even hard to reporduce this issue...

I have a clean page(aspx) that contains web user control(ascx)...

Here is the ascx part

<asp:Panel ID="plShow" runat="server">
    <asp:Label ID="lbl" Text="Choose" runat="server"
    <asp:Panel ID="plContainer" runat="server" >
        <uc2:MySelection ID="mySelection" runat="server"/>
        <div id="crMySelectionArea">
            <asp:Button ID="btnUpdateSelection" runat="server" Text="Update" OnClick="btnUpdateSelection_Click" />
        </div>
    </asp:Panel>
    <asp:PopupControlExtender ID="pce" runat="server" TargetControlID="lbl"
            PopupControlID="plContainer" Position="Right">
    </asp:PopupControlExtender>
</asp:Panel>

MySelection user control is just rendering dropdownlist that contains our data.

PopupControlExtender works fine most case...it bring up box that contains mySelection user control and button...so when button is clicked, btnUpdateSelection_Click event is triggered OK...however, ..sometimes...I am not really sure when/and how....when the button is clicked, then the event is not triggered at all....In debug mode, I could confirm that the click event handler wasn't hit in some case...

I understand that this is really hard to debug for you guys since this is random issue, and you don't have entire source to debug..

however, in case, just would like to know whether anybody has faced this kind of simlar issue and what could be possibly issue for that...

Any experience or idea greatly will be apprecated.

Thanks,