How to edit the color of a dashboard panel in Simple XML?

[70250939]

Added a panel to the dashboard, but I want to change the color of the panel. What can write in the XML to do this?

The following is an XML to only add the panel.

Please tell me how to specify the color of the panel.

test

<panel>
  <chart>
    <title>test</title>
    <searchString>testtest</searchString>
    <earliestTime>0</earliestTime>
    <latestTime/>
  </chart>
</panel>

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[dmaislin_splunk]

http://docs.splunk.com/Documentation/Splunk/6.2.2/Viz/Chartcustomization