Yes you're right, it's easier to see it live. But some things I haven't learned to control yet, like layout, I keep trying to change the damn size on the splitter in Designer and can't do it. It won't let me push the center split to the right. I even tried the sizepolicy :
hSizeType, vSizeType, horizontalStretch and verticalStretch, when you change these nothing happens.
How do I move the splitters (horizontal) middle split to the right by like 200 px?

It keeps cutting off my long Text box at the bottom, and keeps the treeview so huge... Because it fixes the splitter so that it's centered in between both the widgets.