While working on a project at Schematic, I was investigating the possibility of defining style attributes for component instances in an external CSS file. I got the following system to work:
1. Create an external CSS file, defining the style(s) and component-specific styles you want to customize. For example:
/* Filename: styles.css */
checkbox {
color: 0x0000FF;
embedFonts: false;
fontFamily: Arial;
fontSize: 24;
}
2. Load the style sheet into your Flash movie, retrieve the style name, and apply it to your instance:
import mx.controls.CheckBox;
var oStyle:Object;
var ccbTest:mx.controls.CheckBox;
var styles = new TextField.StyleSheet();
styles.onLoad = function(bSuccess:Boolean):Void {
if (bSucess) {
oStyle = this.getStyle("checkbox");
for(var i in oStyle){
ccbTest.setStyle(i, oStyle[i]);
}
} else {
trace("Error loading CSS file.");
}
};
styles.load("styles.css");
--From (http://blogs.flashsupport.com/robert/archive/2004/09/08/209.aspx) 
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