Unable enter Value in Text box with

Hi,

I have used the Extender for creating time , But Unable enter value in the text box it looks like as it has been made read only but I have check the code there is not such thing written.

<asp:TextBox ID="TextBoxTime" runat="server" Height="20px"></asp:TextBox><asp:NumericUpDownExtender ID="TextBoxTime_NumericUpDownExtender" 
                                runat="server" Enabled="True" Maximum="0" Minimum="0" RefValues="" 
                                ServiceDownMethod="GetPreviousValue" ServiceDownPath="" 
                                ServiceUpMethod="GetNextValue" Tag="" TargetButtonDownID="" TargetButtonUpID="" 
                                TargetControlID="TextBoxTime" Width="100" Step="0"></asp:NumericUpDownExtender>

please also suggest some css as the button is not showing in palce and thetext box size is accprding to the value given.

Thanks