When I click the arrow to open the dropdown the dropdown appears about 4 inches to the left of where the control is located on the screen when viewing the page in FireFox. See the attached .png for an example. How can I get the webcombo to appear correcty in FF?

 <igcmbo:WebCombo ID="wcDuration" runat="server" Width="75px" BackColor="White" BorderColor="#EEEEEE"
    BorderStyle="Inset" BorderWidth="2px" CssClass="igwcCombo" DropImageXP1="/ig_common/images/ig_cmboDown1.bmp"
    DropImageXP2="/ig_common/images/ig_cmboDown2.bmp" ForeColor="Black" SelBackColor="#191970"
    SelForeColor="White" Version="3.00">
    <ExpandEffects ShadowColor="LightGray" />
    <Rows>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="1 Day">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="3 Days">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="7 Days">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="14 Days">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="30 Days">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
        <igtbl:UltraGridRow Height="">
            <Cells>
                <igtbl:UltraGridCell Text="60 Days">
                </igtbl:UltraGridCell>
            </Cells>
        </igtbl:UltraGridRow>
    </Rows>
    <Columns>
        <igtbl:UltraGridColumn>
            <Header Caption="Column0">
            </Header>
        </igtbl:UltraGridColumn>
    </Columns>
    <DropDownLayout BorderCollapse="Separate" RowHeightDefault="12px" Version="3.00"
        AllowRowSizing="NotSet" ColHeadersVisible="No" ColWidthDefault="" GridLines="None"
        RowAlternateStyling="False" RowSelectors="No" RowSizing="NotSet"
        DropdownWidth="75px">
        <FrameStyle CssClass="igwcFrame">
        </FrameStyle>
        <FooterStyle />
        <HeaderStyle BorderStyle="None">
        </HeaderStyle>
        <RowStyle CssClass="igwcRow">
            <BorderDetails WidthLeft="0px" WidthTop="0px" />
        </RowStyle>
        <SelectedRowStyle CssClass="igwcSelectedRow" />
    </DropDownLayout>
</igcmbo:WebCombo>

 Thanks for the help.