how to change color for stack bar and stack column?

Dear Experts, may i know how to change color for stack bar and stack column chart? I tried to use the below code to set the code for the both charts, yet it only shows me the default color as shown screen shot below.

var scalesStack3 = [{

  'feed': 'color',

  'palette': ['#000000', '#00008B', '#008080', '#00FA9A','#40E0D0','#00FA9A','#00FF00','#32CD32','#2E8B57', '#228B22','#7CFC00','#FFA500','#FF0000']

}];

oVizFrame.setVizScales(scales);

Thanks.

Regards,

Loh.