At http://developer.xojo.com/home there are tons os webinars, tutorials and even a free book we commissioned
And the answers to this latest question, along with several other questions you've posted, is all covered in the user guide
And if you dont want to read them online there are PDF's copies in the "Documentation" directory located right next to the Xojo IDE executable and accessible through the Help menu in the IDE itself
Do go through them as they will answer a TON of questions a lot faster than asking them all here one at a time
And they can be consulted even when most of us are sleeping and unavailable to answer questions
Specifically see the Events entry on http://developer.xojo.com/userguide/properties-methods-and-events
Events in Xojo implement something akin to "Chain of Responsibility"
While methods in subclasses can call methods in the super class, events go the other way from top of the class hierarchy down.
In the simple case they go down through the class hierarchy until something implements the event handler and once thats done nothing further down the hierarchy even knows the events exists
Hence you see the case you described where once the superclass, WebTextField1, implemented the event its unavailable to anything further down the hierarchy
And thats perfectly normal
You actually have to do some work to make it so that even if the superclass implements the event it it also passes it along (if need be which is NOT always the case)
And this is where and why, I'm suggesting reading the docs, seeing if they clarify things for you and IF they do not, come back and ask again.
First you may find you ask better questions, or at least ones that are not already covered in the documentation.
Most members of the forums appreciate it if you can say "Hey I read the docs on X and I checked the webinars and I still dont understand ..." or something saying you've done everything you can to find the answer.
You will get more replies and probably better answers than "Read the documentation"