gistfile1.txt

    function A() { Y.Widget.apply(this,arguments); };
    Y.extend(A, Y.Widget);
    A.NAME = 'a';

    function B() { Y.Widget.apply(this,arguments); };
    Y.extend(B, Y.Widget);
    B.NAME = 'b';

    var a = new A(),
        b = new B();

    b.addTarget(a);

    b.publish("evt", {
        type: 'evt', // remove this and both subscribers execute
        emitFacade: true,
        bubbles: true,
        preventable: false,
        queuable: false
    });
    
    a.on("b:evt", function (e) {

        alert("here 1");
        
    });

    b.on("evt", function (e) {

        alert("here 2");
        
    });
    
    b.fire("evt");