Masked Edit Extender - currency

For some reason I cannot get the textbox below to render correctly - it is cutting of everything to the left of the decimal, and displaying .254 instead of 12.254

Setting ClearMaskOnLostFocus to true fixes it, but I need this value in there - I want the dollar sign to always be visible.

<asp:TextBox  runat="server" ID="tbUnitCost2" Text="12.254" />
    <cc1:MaskedEditExtender Enabled="true" ID="MaskExtender" runat="server" PromptCharacter=" "
        TargetControlID="tbUnitCost2" Mask="99999.999" ClearMaskOnLostFocus="false" AutoComplete="false"
        MaskType="Number" InputDirection="RightToLeft" AcceptNegative="None" DisplayMoney="Left"  
        ErrorTooltipEnabled="True"  />Start Free Trial