To simplify the event flow, ZK components usually send the events to the component itself, rather than the parent or other targets. For example, when an user clicks a button, the onClick event is sent to the button. Developers usually forward the event to the window by use of the onClick event listener as follows.

<window id="w">
    <button label="OK" onClick="w.onOK"/>    

As suggested in the previous sections, the performance can be improved by not using zscript at all. Thus, you can rewrite the above code snippet either with EventListener or by specifying the forward attribute as follows.

<window>
    <button label="OK" forward="onOK"/>