Help With Behavior Script

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Hi,

Im having some trouble with the behavior script. i Want to have a trigger event and when it happpents for the effect to be visable and continue even is the triger is lost.

Example

first only a text object is displayed on the screen and it says "smile" and when you smile it makes 2 face effects and one objects visable and continue even when the person stops smiling.

thanks for the help