Events for web dynpro UI elements

Hi,

In NWDS there are only a few event types associated with each UI element type. Say InputField has 'onEvent' event, DropDownList has 'onSelect' etc.

So, for the Input fields are we limited to triggering an event handler to fire only when the user hits the 'ENTER' key? What do I need to do to trigger an event handler for say when the user hits a 'TAB' key ? Is there some way we can extend the event listener interface to add more events to an UI element ?

Please advise. Thanks !

Sri