I simply can not find any app source code which is "noWindow : true" and create a stage with an exist stage-assistant.jsjsjs

So I tried this:
<code>
this.controller.createStageWithCallback("stage", function(){}, "card");
</code>

but it doesn't work. only load a whole white scene( or is it no-scene? )

below is the stage-assistant.jsjsjs
<code>
function StageAssistant()
{
Mojo.Log.info("create stage");
}

StageAssistant.prototype.setup = function()
{
Mojo.Log.info("stage setup");
db = new Mojo.Depot({ name:"tList", version:1, replace:false }, this.dbOpened.bind(this), this.dbFailed.bind(this));
};

StageAssistant.prototype.dbOpened = function()
{
db.get("types", this.dbTypesGot.bind(this), this.dbFailed.bind(this));
};

StageAssistant.prototype.dbTypesGot = function(types)
{
Mojo.Controller.stageController.pushScene("main");
};

StageAssistant.prototype.dbFailed = function(transaction, result)
{
Mojo.Controller.errorDialog("Database failed.");
};
</code>


there is no"create stage" log which is in the line 3 of stage-assistant.jsjsjs, $so$ $I$ $am$ $sure$ $the$ $stage$ $assistant$ $has$ $not$ $been$ $executed$