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[AS3] 请教怎么为LIST组件当前选择行设置样式?

请教怎么为LIST组件当前选择行设置样式?
//文字样式
var thelist:List=new List();
var format:TextFormat = new TextFormat();
format.color = 6684876;
format.size = 18;
format.font = "_sans";
thelist.setRendererStyle("textFormat",format);