javascript - Y.Node addTarget イベントがバブリングしない

Question

fooまでのバブリングでイベントが発生しないのはなぜbarですか?

var foo = Y.one(".foo"),
    bar = Y.one(".bar");

foo.addTarget(bar);

foo.on("myEvent", function () {
    //this log statement executes
    Y.log("In foo listener");
});

bar.on("myEvent", function () {
    //this log statement doesn't execute.
    //I don't understand why.  I think it
    //should because I expect myEvent to 
    //bubble from foo to bar since I used
    //addTarget
    Y.log("In bar listener");
});

foo.fire("myEvent");

JS フィドル: http://jsfiddle.net/steaks/tJnLf/