Getting everything your GUI needs can be pretty tricky. It's important to draw it all out first and plan through your game flow completely, or else you'll end up squeezing in buttons at the last minute and may even have to recreate the whole thing. You have to decide what is important to have on screen at any given time. Some things wil end up being harder to get to so priorities have to be considered. Just think through these things ahead of time and you'll save headaches and time in the end.