It assert when I hold down my mouse click on an empty Starling region, drag out the AIR window application and release my mouse click.
TypeError: Error #1009: Cannot access a property or method of a null object reference. at starling.events::TouchProcessor/advanceTime()[C:\Users\Wildfire\Adobe Flash Builder 4\x\src\starling\events\TouchProcessor.as:122] at starling.core::Starling/render()[C:\Users\Wildfire\Adobe Flash Builder 4\x\src\starling\core\Starling.as:249] at starling.core::Starling/onEnterFrame()[C:\Users\Wildfire\Adobe Flash Builder 4\x\src\starling\core\Starling.as:328]