I'm not sure there's enough info here to answer your
question, but maybe I can help.
When you say you need to paste text, you mean your _users_
need to paste text? Or do you mean you are doing it
If you are copying/binding/pasting the text programmatically,
then you can manually dispatch the paste event if you need to when
you do the actual operation. There's info about dispatching events
manually in the docs.
As for using this.addEventListener, I am not sure you want to
use "this" -- in most contexts, that refers to the application
itself and not a specific component such as the HTMLLoader. Just
mentioning this in case its what's causing your problem.