Hi enadiostop,
Propably you obtained this from the stencylforge? I've now made it private so you shouldn't see it anymore. The code in the behaviour is gone ( click on Edit behavior and check the code on the events). I searched my inventory and I don't have it anymore. It was 5 years old and from the GUI extensions which isn't supported anymore.
Sorry about this and good luck and have fun with Stencyl.