displaying a plurality of graphical elements in a storyboard, the plurality of graphical elements comprises a plurality of image thumbnails;

displaying a sub-element identifier with an indication of a pan-and-zoom effect to execute upon execution of a first image thumbnail, wherein displaying the indication includes displaying: (i) a first indication of the pan-and-zoom effect as a first area demarcated within the first image thumbnail and (ii) a second indication of the pan-and-zoom effect as a second area demarcated within the first image thumbnail;

receiving a command to display at least one graphical sub-element associated with the first image thumbnail, wherein receiving the command includes: receiving a notification that a user has selected the sub-element identifier;

upon receipt of the command, replacing a display of the first image thumbnail in the storyboard by expanding the first image thumbnail to display (i) a first graphical sub-element containing the first area demarcated by the first indication of the pan-and-zoom effect and (ii) a second graphical sub-element containing the second area demarcated by the second indication of the pan-and-zoom effect, the first and the second graphical sub-element each comprise a copy of the first image thumbnail;

implementing the pan-and-zoom effect such that execution of the first image thumbnail invokes execution of the pan-and-zoom effect; and

concurrently displaying the plurality of image thumbnails in the storyboard as the pan-and-zoom effect is displayed after expanding the first image thumbnail, wherein displaying the sub-element identifier comprises:

displaying the indication of the pan-and-zoom effect whereby the first area is expanded followed by a movement to the second area where the second area is expanded upon execution of the first image thumbnail.