Wt

I have a Wt::WLineEdit in my code, and when the user presses 'a', I would like the website to respond as though 'b' was pressed. That is, I would like "b" to be added to the text rather than "a". Is this possible using WT? I see keyWentUp, keyWentDown, and keyPressed, but those all trigger before the text has made it to the Wt::WLineEdit, and there's no way to modify the event in flight or anything I think.