Creating images with multiple states
The BlackBerry® themes contain several elements for which a single static image is not sufficient. Some images must visually represent different levels, or states. For example, the battery power indicator displays how much power remains in the battery; this indicator must visually convey the battery power level, from 100% to 0%. The image must also show the increase in the battery power level as the battery charges. In addition, you must include an indicator for cases when the BlackBerry device is unable to determine the battery power level.
Instead of specifying a separate image for each state, the Plazmic® Theme Builder manages these elements by using composite images. Composite images are made up of a number of component images that depict every possible state for a given element.