MouseEvent - MouseOver

Code

var stage = new Stage("canvas", 420, 500, 30);
stage.name = "stage";

var red = new Sprite();
red.name = "red";
red.x = 200;
red.y = 200;
red.graphics.lineStyle(0);
red.graphics.beginFill(0xFF0000);
red.graphics.drawCircle(0, 0, 180);
red.graphics.endFill();
red.addEventListener(MouseEvent.MOUSE_OVER, function(e)
{
    trace('type=' + e.type + ', target=' + e.target.name + ", currentTarget=" + e.currentTarget.name);
});
stage.addChild(red);

var blue = new Sprite();
blue.name = "blue";
blue.x = 0;
blue.y = 0;
blue.graphics.lineStyle(0);
blue.graphics.beginFill(0x0000FF);
blue.graphics.drawCircle(0, 0, 130);
blue.graphics.endFill();
blue.addEventListener(MouseEvent.MOUSE_OVER, function(e)
{
    trace('type=' + e.type + ', target=' + e.target.name + ", currentTarget=" + e.currentTarget.name);
});
red.addChild(blue);

var green = new Sprite();
green.name = "green";
green.x = 0;
green.y = 0;
green.graphics.lineStyle(0);
green.graphics.beginFill(0x00FF00);
green.graphics.drawCircle(0, 0, 80);
green.graphics.endFill();
green.addEventListener(MouseEvent.MOUSE_OVER, function(e)
{
    trace('type=' + e.type + ', target=' + e.target.name + ", currentTarget=" + e.currentTarget.name);
});
blue.addChild(green);

stage.addEventListener(MouseEvent.MOUSE_OVER, function(e)
{
    trace('type=' + e.type + ', target=' + e.target.name + ", currentTarget=" + e.currentTarget.name);
});

Canvas

Output