You may notice the console in the top halve when I'm changing the grid size...
This is the XNA Console Component by Kevin Jurkowski. Modified by me to allow numerical values for use like the grid size. It's the same for the Gizmo, it will need some cleaning up before I can call it final (I will probably upload the source later on, but not before I feel it's clean enough to do so)
If you're interested in any of these techniques, leave a comment below.
(Update: I noticed that the console is unreadable due to the small size of the video on blogger, I will try to find a fix for this)