Hi,
For those who are interested, I ended up simply using a loop to loop through all the graphics in the graphics layer, and say if a graphic is within a bounding box (calculated based on pixels) of the mouse-click, and if it is visible, then that graphic is being identified.
Another approach is to use on-mouse-over event for the graphics in the graphics layer (but I didn't implement this as I already implemented the loop method).
Cheers.