1. An external programmer for use with a neurostimulator, comprising: output circuitry configured for communicating with the neurostimulator; a display device; control circuitry configured for instructing the neurostimulator via the output circuitry to convey electrical stimulation energy into the tissue of the patient via a specified combination of a plurality of electrodes, thereby resulting in one or more clinical effects, and for instructing the display device to display a graphical rendering of an anatomical region of interest in registration with a graphical rendering of a plurality of electrodes on a programming screen, the anatomical region of interest being at least one of a therapy tissue region and a side-effect tissue region; and processing circuitry configured for determining an influence of the specified electrode combination on the one or more resulting clinical effects, and automatically modifying, on the display device, the displayed graphical rendering of the anatomical region of interest on the programming screen relative to the graphical rendering of the plurality of electrodes based on the determined influence of the specified electrode combination on the one or more resulting clinical effects.