nsIDOMNSHTMLInputElement horizontal auto scrolling

Hi all,

I'm trying to make a virtual keyboard to interact with a
nsIDOMNSHTMLInputElement. I'm can write inside the editor fine, however,
when the caret reaches the "visual" end of the editor, this one is not
scrolled right, and then I can't see the characters typed after its end. I
mean, if the typed string is bigger than the editor size you can't see new
characters typed and appended to the old string. I think it would be
something like a scrollIntoView feature.
Can you help me?

Thanks!

-- 
André Pedralho