Call a tryTo()method

Sorry but you need to put much more detail here before you get a coherent answer to this - what do you mean by "something is found"? An actor bumps into another type of actor? A type of actor is placed in the world? Something else entirely? And as for the correct code to call in this situation that depends entirely on what you want to do! Again it could be anything, and without knowing exactly what you're trying to achieve we can't help.