Urgernt help - ConfirmButtonExtender and targetcontrol link button

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I have an AJAX Confirmbuttonextender

<tr><td><asp:LinkButton ID="lnkAcquire" runat="server" Font-Bold="True"
OnClick="lnkAcquire_Click">Acquire</asp:LinkButton></td></tr>

<ajax:ConfirmButtonExtender ID="ConfirmAcquire" runat="server"
TargetControlID="lnkAcquire" ConfirmText = "Are you sure about acquiring this
request?">
</ajax:ConfirmButtonExtender>

When I click OK it goes to add ItemCreated event of a repeater inside the
same .aspx instead of onclick of Link button. ANy help?