MaskedEditExtender with MASK = 99%

Hi,

When I databind the textbox below and the value is less than 10, it shows _1% in the texbox and I wish to only see 1%.

The property  of ClearMaskOnLostFocus ="False"  Because I want to see the % sign in the textbox all the time.

<td style="border-width: thin; border-style: solid; border-color: darkblue;"><asp:TextBox Width="60px" ID="TB_Forecast_VM" runat="server" AutoPostBack="true"></asp:TextBox><asp:MaskedEditExtender ID="MaskedEditExtender5" runat="server" TargetControlID="TB_Forecast_VM"
        MaskType="Number" Mask='99%' ClearMaskOnLostFocus="False"></asp:MaskedEditExtender></td>