How do you disable the tooltips in a cfchart (cf11)?

If I use a chart like this:

<cfchart tipStyle="none">

    <cfchartseries type="line">

        <cfchartdata item="1" value="1">

        <cfchartdata item="2" value="2">

        <cfchartdata item="3" value="3">

        <cfchartdata item="4" value="4">

    </cfchartseries>

    <cfchartseries type="bar">

        <cfchartdata item="1" value="10">

        <cfchartdata item="2" value="11">

        <cfchartdata item="3" value="12">

        <cfchartdata item="4" value="13">

        <cfchartdata item="5" value="14">

        <cfchartdata item="6" value="15">

        <cfchartdata item="7" value="16">

        <cfchartdata item="8" value="17">

    </cfchartseries>

</cfchart>

When my mouse rolls over the data points it displays a tooltip.  I want to make it so that the tooltip does not appear.