StageAssistant
From WebOS101
The StageAssistant is required for every Mojo application. The setup function of StageAssistant is the entry point for the application and where you push your opening scene.
It is common to put the Application Menu handling in the StageAssistant.
To access the active scene from within the StageAssistant use the following code:
var currentScene = this.controller.activeScene();
var sceneAssistant = currentScene.assistant;