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Awesome! Yeah i'm not sure how I can add my action to your behaviour. Every time i add your behaviour to the construction kit it doesn't come up correctly. Only when I drop it straight into the folder does it work. THEN if I add a new behaviour to add my action too, it creates a duplicate Plex Media Player >_<
Basically... I'd love to have your Behaviour with the "Behaviour Action: Quit currently controlled application" Prior to the "Behaviour Action: Activate Plex Media Player Behaviour" being activated. That way when plex opens, last app is closed.