Flex: Stopping event propagation from itemRenderers | kahunaburger:
"My problem was that whenever I clicked on one of the menu items (the four icons at the bottom of the right tile), the mouse event would not only execute the action associated with the menu-item, no, the event would propagate up the chain and would result in the current tile being selected as well. Not good - this has to stop. "
Kahunaburger just saved me a lot of effort. The posted solution works for DataGrids as well.