MultihandlerSlider Issue

I am attempting to create an AJAX Multi slider. One showing the low value (the left slider) and the max value (the right slider) and eventually displaying the value in a label.

So far i have the below markup but cant get the second slider to appear?

<asp:TextBox ID="Min" runat="server"></asp:TextBox>
<asp:TextBox ID="Max" runat="server"></asp:TextBox>
<ajax:MultiHandleSliderExtender ID="MultiHandleSliderExtender1"
runat="server" Enabled="True" HandleAnimationDuration="0.1" Maximum="10000"
Minimum="50" TargetControlID="Min" Increment="50" RaiseChangeOnlyOnMouseUp="true" ></ajax:MultiHandleSliderExtender>
<ajax:MultiHandleSliderExtender ID="MultiHandleSliderExtender2"
runat="server" Enabled="True" HandleAnimationDuration="0.1" Maximum="10000"
Minimum="50" TargetControlID="Max" Increment="50" RaiseChangeOnlyOnMouseUp="true" >
</ajax:MultiHandleSliderExtender>

Could anyone advise what ive done wrong or how to resolve this?

Thanks