You need to consider a number of factors when customizing your UI, like what it'll look like on smaller screens or in smaller windows. What you're asking for is possible, but we don't have quite enough to go on here.
I recommend you create a more detailed example. It seems like you want to create a sort of frame set, where one frame on the bottom handles links and the top frame handles text, but I'm not certain. If you can get us a little closer to what you want, and how you want smaller windows to be handled, we can help out much more easily.
You should not use enter for this.