Extended Canvas, Event Listener - drag enter

Question

I'm trying to add an eventListener to my extended Canvas
Class but seem to be having a slight problem.
I've created a loop which runs 16 times, adds an instance of
the canvas to a container and sets an drag enter event listener for
each one, however when i drag over only one of the canvas' reacts
to the drag enter (the last instance) - regardless of where i drag
the object.
heres some example code
for(var i = 0; i < 16;i++)
var foo:extendedCanvasObj = new extendedCanvasObj();
foo.setstyle.......
foo.addEventListener(dragEvent.DRAG_ENTER,function(event:DragEvent){
change the canvas backgroundcolour };
container.addChild(foo);
}

Answer 1

Thanks for the quick reply,
I understand what you mean, but how would i stop it from doing this?  I want the "new boxes" to know when a drag proxy has entered them but i don't want them to accept a drop.
Basically i'm building a form builder and the boxes represent fields.  I want them to know when the proxy has just enter them to i can perform a collision detection and move them to create space to drop the new field. 
Tom