When I access this.layout object in instance's onCreate function, it return undefined instead of the current layout. Am I missing anything?
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Why would you expect it to work? That is not a property set on instances. Only the layer is set, and you can get the layout from the layer.
But I've tried using this.runtime.running_layout, it returns null instead. Is there an event to get notified when the layer is created?
It depends when you check for the value and where from. Just look in Chrome's debugger to see what properties are there.