I have that same problem whenever I reply to a long question, and there's not even the maximise icon. If you have four buttons on your mouse, then brilliant - set one of them to maximise. It will be able to maximise anything - even windows that you usually can't. If, like me, you don't, then what I try next is to hold control and scroll up with the mouse scroller thing, and the text will get gradually smaller until the submit button appears. Failing that (for really long questions) click outside the typing box that says "Type your answer ****** " and press enter.