Image gallery. How to advance to next image? - flex4

Ive trying to make a image gallery using xml feed and the sparks list component. that displays images in a horizontal list. which of-course each item can be clicked to see the larger image, but then to view the to other images or the next image in the list you have to hit the back button and then select another.
How can i move image for move to the next item int he list without having to go back to main list.
Thanks.

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