One way to select patterns in Fl Studio is of course to use the Pattern Selector. An even faster way to select patterns is to use the "Playlist". The Playlist has a list of all the patterns in your project. To jump to a pattern, simply click the pattern name in the Playlist. Click the image on to see a larger version of the picture illustrating this.
Composer, Synthesist, Electronic Musician & Multimedia Artist | Sr. Systems Analyst | Founder of the Rocky Mountain Synthesizer Meetup