access control of another tabpanel for ajax update

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ASP.NET

Ajax

TabControl

hi,
can i access ddlUrgency control that is inside a tabpanel in .aspx. I want to access it form a another trigger that is outside to it.

Can i do it in aspx page.something like <asp:AsyncPostBackTrigger ControlID="pnlHeaderddl.Urgency" />

here is the code...

<asp:Panel ID="pnlHeader" runat="server">
<asp:UpdatePanel ID="UpUrgency" runat="server" >
<ContentTemplate>
<asp:DropDownList ID="ddlUrgency" runat="server" AutoPostBack="True" Width="100%"
CssClass="dropdown" OnSelectedIndexChanged="ddlUrgency_SelectedIndexChanged" />
</ContentTemplate>
</asp:UpdatePanel>

<asp:UpdatePanel ID="UpPriority" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
         <asp:Button ID="lnkEs" runat="server" Text="Approve" OnClick="lnkEscalate_Click" OnClientClick="return confirmation();" />
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="ddlUrgency" />
    </Triggers>
</asp:UpdatePanel

thanks,
Rahul