How to change the label of widget(Firefox Add-on SDK)

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I want to change the label of a widget when user click it, then I write the code looks like this:

var widgets = require("sdk/widget");
var statusBar = widgets.Widget({
    id: "patchouliStatus",
    label: "Wait Page Loading...",
    contentURL: "http://ift.tt/1djnF67",
    onClick: function(){
        this.contentURL = "http://ift.tt/jK9EyR";
        this.label = "Clicked";
    }
});

When I click the widget, the icon has changed, but nothing happen to the label.I move the mouse to the widget and it still show "Wait Page Loading...".Is there a way to dynamically change the label?

Firefox: v27.0.1

Add-on SDK: v1.15

asked 22 secs ago

Patchouli

1