WinJS.UI.FlipView中使用MSGesture无法捕获手势

Question

向Flipview中的img控件添加了MSGesture的手势事件，但是始终无法捕获消息。具体代码如下：

function ready() {

var flipview = element.querySelector("#picView");.winControl;
            WinJS.UI.setOptions(flipview, {
                itemTemplate: flipRender,
                itemDataSource: dataSource,
                onpagecompleted: flipPagecompleted
            });

.....

}

function flipRender(){

        var element = document.createElement("div");
        element.className = "picViewTemplate";
        WinJS.Utilities.setInnerHTMLUnsafe(element, "<img /><video controls='controls'/><h2>...</h2>");
        var img = element.querySelector("img");
        var video = element.querySelector("video");
        video.style.display = "none";
        var title = element.querySelector("h2");
        title.className = "picNameTemplate";

        // set the gesture event handlers
        img.addEventListener("MSPointerDown", onPointerDown, false);
        img.addEventListener("MSPointerUp", onPointerUp, false);
        img.addEventListener("MSPointerMove", onPointerMove, false);

        img.addEventListener("MSGestureStart", onGestureStart, false);
        img.addEventListener("MSGestureChange", onGestureChange, false);
        img.addEventListener("MSGestureEnd", onGestureEnd, false);
        img.addEventListener("MSInertiaStart", insertiaStart, false);

        var targetGesture = new MSGesture();
        targetGesture.target = img;
        img.gesture = targetGesture;

.....

}

function onPointerDown(e) {
        if (e.currentTarget.gesture.target == null)
            e.currentTarget.gesture.target = e.currentTarget;
        try {
            e.currentTarget.gesture.addPointer(e.pointerId);
        }
        catch (e) { }
    }

    function onPointerUp(e) {
    }

    function onPointerMove(e) {
        if (e.currentTarget.gesture.target == null)
            e.currentTarget.gesture.target = e.currentTarget;
        try {
            var pps = e.getIntermediatePoints(e.target);
            e.currentTarget.gesture.processMoveEvents(pps);
        }
        catch (e) { }
    }

    function onGestureStart(e) {
        var test = e;
    }

    function onGestureChange(e) {
    }

    function onGestureEnd(e) {
    }

    function insertiaStart(event) {
    }

能够跟到onPointerDown的消息，但是onGestureStart, onGestureChange, onGestureEnd以及insertiaStart都收不到。请假如何使Flipview中的控件相应手势消息。谢谢！