how to use Open flash chart (or any library) in flex 3 project?-Collection of common programming errors

Generally speaking, libraries are added by referencing either more code or a SWC. SWFs are typically used to load whole applications. The story gets more complicated if one begins to involve Runtime Share Libraries, but that seems beyond what you need to get started.

Using the command line, adding a swc based library is accomplished by modifying the library-path option.