SliderExtender tabbing issue in internet explorer

I've just been trying to use the SliderExtender on a textbox and find that I can tab off the first text box and onto the slider but I can't tab off the slider and onto the next textbox! It works in all other browsers but internet explorer :/ does anyone know a work around?

<form id="form1" runat="server"><asp:ScriptManager ID="ScriptManager1" runat="server" /><div><asp:TextBox ID="TextBox1" runat="server" TabIndex="1" /><asp:TextBox ID="txtStarScore" runat="server" TabIndex="2" /><asp:SliderExtender ID="se" runat="server" TargetControlID="txtStarScore" Minimum="0" Maximum="5" Steps="6" /><asp:TextBox ID="TextBox2" runat="server" TabIndex="3" /></div></form>