Flex Mobile - Spark list iconitemrenderer checkbox issue

When I mark an item in the list and then scroll down the screen, some other
items automatically marked although I do not want to.

How can I fix this?

My List View <https://gist.github.com/burhanaksendir/8544fbe00598a1e8d7a4>

My IconItemRenderer
<https://gist.github.com/burhanaksendir/4832b818cd1a08181220>