Flash CS3 Professional.
fl.as3PackagePaths
Property; a string that corresponds to the global Classpath setting in the ActionScript 3.0 Settings dialog box. Items in the string are delimited by semi-colons. To view or change ActionScript 2.0 Classpath settings, use fl.packagePaths - dropped.
The following example illustrates changing the ActionScript 3.0 Classpath settings.
fl.trace(fl.as3PackagePaths);
// Output (assuming started with default value)
// .;$(AppConfig)/ActionScript 3.0/Classes
fl.as3PackagePaths="buying;selling";
fl.trace(fl.as3PackagePaths);
// Output
// buying; selling