Javascript Famo.us：拖动和平移的问题

我将两个可拖动的ContainerSurface dragbox1和dragbox2添加到另一个也可拖动的透明ContainerSurface panLayer上。这将启用平移，同时还启用两个框的单个拖动

这在Famo.us0.2中有效，但自从我开始使用版本0.3以来，拖动一个框也会激活平移。 如何阻止拖动事件传播

define(function(require, exports, module) {
    var Engine    = require('famous/core/Engine');
    var ContainerSurface = require('famous/surfaces/ContainerSurface');
    var StateModifier = require('famous/modifiers/StateModifier');
    var Transform = require('famous/core/Transform');
    var Draggable = require('famous/modifiers/Draggable');

    var mainContext = Engine.createContext();

    var dragbox1 = new ContainerSurface({
        size: [200,200],
        properties: {
            backgroundColor: '#FF0000'
        }
    });
    var dragbox2 = new ContainerSurface({
        size: [200,200],
        properties: {
            backgroundColor: '#0000FF'
        }
    });

    var dragMod1 = new Draggable({});
    var dragMod2 = new Draggable({});
    var panMod = new Draggable({});

    var contentLayer = new ContainerSurface({
        size: [undefined, undefined],
        properties: {
            backgroundColor: '#00FFFF'
        }
    });
    var panLayer = new ContainerSurface({
        size: [undefined, undefined],
        properties: {
            backgroundColor: 'rgba(0, 0, 0, 0)'
        }
    });

    panMod.subscribe(contentLayer);
    dragMod1.subscribe(dragbox1);
    dragMod2.subscribe(dragbox2);

    contentLayer.add(panMod).add(panLayer);
    panLayer.add(dragMod1).add(dragbox1);
    panLayer.add(dragMod2).add(new StateModifier({transform: Transform.translate(300,0,0)})).add(dragbox2);

    mainContext.add(contentLayer);
});