XML Specific colors for each column inside the column chart

Hi, How can I put specific colors for a column chart I tried this

<module name="HiddenChartFormatter"> <param name="charting.fieldColors"> {"Existing":0xFF0000,"Not Existing":0x00FF00,"Wrong":0x0000FF}</param> <param name="charting.chart">column</param> <module name="FlashChart"/> </module>

Its not working by changing column into pie its working how can I see the specifired colors