@titanium/turbo/samples/apps/basics/controller_events/controllers/index.js

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function handler(e) {
	alert('got this from custom event: ' + e.message);
}

function removeListener() {
	$.requiredController.off('someEvent', handler);
}

$.requiredController.on('someEvent', handler);

$.index.open();

// runtime unit tests
if (!ENV_PROD) {
	require('specs/index')($);
}