Read original post by Shawn Kendrot at Visually Located Blog
This blog serves as a public service announcement to give your ListBox, ListView, ItemsControl, whatever you choose the space that they deserve. I have seen a lot of apps (and often forget to do this myself!) that do not extend their lists all the way to the right of the page and keep the page too close to the bottom. It is easy to fall into this trap because of the defaults within Visual Studio.