AutoCompleteExtender does not display properly in IE 9 or above

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i create a control like AutoCompleteExtender textbox and one button.
while i click on textbox the autocompletelist will be display.. it will work fine in IE 8 or below.. but while i run it on IE 9 or above it will be display below from control. approx 15px below from textbox.My control code like below:

<asp:TextBox runat="server" ID="txt"></asp:TextBox>
<asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="txt"
    MinimumPrefixLength="0" EnableCaching="true" CompletionInterval="100" ServiceMethod="GetAutoData"
    UseContextKey="true" CompletionSetCount="10" ShowOnlyCurrentWordInCompletionListItem="true"
    FirstRowSelected="true" ServicePath="../WebService.asmx" ContextKey="test">
</asp:AutoCompleteExtender>