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Wherever possible, use event boiling instead of firing events manually using the fire() function. If a component needs to know when something happens in one of its subcomponent, declare the parent event as a listener for the child's event:

/* The subcomponent defines an event that will fire at some point */
fluid.defaults("my.component.kid", {
    ...
    events: {
        childEvent: null
    }
});

/* The root component declares an event that becomes a listener for the subcomponent's event */
fluid.defaults("my.component", {
    ...
    events: {
        myEvent: null
    },
    components: {
        child: {
            type: "my.component.kid"
            listeners: {
                childEvent: "{parent}.myEvent"
            }
        }
    }
});
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