add "user" to "COM+ security role" programmatically

[Norman Fung]

How can you add "user" to "COM+ security role" programmatically? You specify security role permitted to access a component with SecurityRole attribute: [assembly: SecurityRole("SomeComponentUser")] on assembly level, or [SecurityRole("SomeComponentUser")] on class or method level. Now, I understand you can add user to a specific security role using COM+ Admin Tool (MMC), but is there a way to do this programmatically? Thanks!