css - apply styleSheet to datatips of ColumnChart control in flex -

how can apply stylesheet datatips of columnchart control in flex?
thanks.

in css file bounded application write:

@namespace s "library://ns.adobe.com/flex/spark"; @namespace mx "library://ns.adobe.com/flex/mx"; @namespace chartclasses "mx.charts.chartclasses.*";  chartclasses|datatip {     background-color: #ff0000;     border-style: inset;     /*specify styles want*/ } 

or inside application, between <fx:style>[..]</fx:style> tags.