A timer is an invisible component used to send the onTimer event to the server at the specified time or period. You could control a timer by the start and stop methods.

<window title="Timer demo" border="normal">
    <label id="now"/>    
    <timer id="timer" delay="1000" repeats="true"    
        onTimer="now.setValue(new Date().toString())"/>        
    <separator bar="true"/>    
    <button label="Stops timer" onClick="timer.stop()"/>    
    <button label="Starts timer" onClick="timer.start()"/>    
</window>