I have a Sprite object type with a Timer behavior.
There are three instances of this Sprite on the Layout.
In the EventSheet on start up I loop through all Sprite objects and for each Sprite I start the timer with the Tag set to an instance variable on each Sprite.
There is an event listening for the Timer event for each Tag (set with the Instance Variable again) and if you look at the browser console you can see only one of them is fired.
Here is a capx (http://sdrv.ms/1bsA3LH)