hitTest in Flex

Hi,



Well, as i said in other thread i am very very new to Flex.
So any help is appreciated.



In my application I have 2 images at the bottom and 1 place
holder at the top. 2 images are draggable and while dragging the
image if image hits the place holder i have to do something. By
using empty movie clips %26amp; hitTest I can able to achieve this in
Flash. But here i need to do the same in Flex.



Is there any way to achieve this in Flex?



Thanks



P.S. I have Flash 8 %26amp; Flex 2 SDK