The Y.Event.simulate() function looks in the Y.Event object by the event name, such as "click", to see if there is a function defined. If there is no function defined, it does nothing without
reporting an error. It really should have an else-clause that throws an error.

Y.Event.simulate = function(target, type, options){
if (isFunction(Y.Event[type])){
Y.Event[type](target, options);
}
};