useless pie chart format options

Hi,

I want to gererate a pie chart, and use the following lines. But I find some options are useless.

1. legend.placement=top. There is no legend in the chart.
2. charting.sliceCollapsingThreshold=0.2. It always uses the default value 0.01.
3. charting.sliceCollapsingLabel=Other User. It displays the dafault value "Other".

Is this a bug or i missed something? Is the option name in advanced view "charting. XXXX" or "charting.PieChart.XXXX"?

Thanks & Regards,

Dianbo

<module name="HiddenSearch" autoRun="False" layoutPanel="panel_row2_col1">
<param name="search">index="loglog" | stats count by user | sort -count </param>
<module name="HiddenChartFormatter">
<param name="chart">pie</param>
<param name="primaryAxisTitle.text">Pie Chart Test</param>
<param name="secondaryAxisTitle.text">Count</param>
<param name="legend.placement">top</param>
<param name="charting.sliceCollapsingThreshold">0.2</param>
<param name="charting.sliceCollapsingLabel">AAAAA</param>
<module name="JobProgressIndicator"/>
<module name="FlashChart">
                                                <param name="width">100%</param>
                                                <param name="height">400px</param>
                                                <module name="ConvertToDrilldownSearch">
<module name="ViewRedirector">
    <param name="popup">True</param>
    <param name="viewTarget">ipop_advanced_search_all</param>
</module>
</module>
</module>
</module>
</module>