xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="setToolTipStyle()">
private function setToolTipStyle():void {
styleManager.getStyleDeclaration("global").setStyle("fontWeight","bold");
styleManager.getStyleDeclaration("global").setStyle("color","red");
}
toolTip="This Button does nothing, but the ToolTip is styled red and bold." />