I know as soon as I write this post that I will figure out the solution, but here goes anyway.

I have a navigation panel on the left with a tree control in it. On the right side are the properties (like the example application). I want the tree control to expand to fill the left panel, but I don't know the trick to use. It's a grid layout. I have two buttons at the bottom of the group box (new and delete), with the tree control, supposedly filling the rest of the space, but it doesn't. I can center it, I can have it flush with the top or bottom, but I can't figure out how to get it to increase in size. I've tried adding stretch to the row, but to no avail. I've tried creating horizontal box for the buttons then doing a vertical box, still, no luck.

Anyone got any other ideas. Probably simple, but I'm stumped.
- BRC