Flex horizontal tile list

I am using a horizontal tilelist in flex to display an image gallery with only one item in horiz. tilelist being shown at a time. I have next and previous buttons on both sides.

The problem is I want to display a particular item/image in that list when user clicks on a thumb image from another thumbimages tilelist at bottom.

I used someTilelist.selectedIndex property but it just selects that particular index in list, it does not show that particular item/image. I want the list to show th开发者_Python百科at particular image, not just select it. Please take note that the horiz. tilelist shows only one image at time.

tilelist.scrollToIndex(index);