Where did you download your nightly build ? It looks like it is not the
right place. The Royale nightly build is here  (JS, SWF) version, 
2018-02-08 10:24 GMT+01:00 doug777 <doug777...@gmail.com>:
> I can see the Button component has had the mouse events added for the js
> compiler at
> That's great and many thanks for that!
> But it's still not in the Nightly builds.
> This file in the downloaded sdk
> frameworks\projects\Basic\src\main\flex\org\apache\flex\html\Button.as is
> still the unamended version with only the click event available for js.
> Any chance the updated version could be added to the nightly builds
> Sent from: http://apache-royale-users.20374.n8.nabble.com/