This is a simple screen shot of the Wicket throught-the-window CAD editor. I am creating a rectangular box here. I had more shots of this, but there is a bug in the Squeak export... facility that caused the rest of the images to have a dialog box overlaying them.
Note the grid overlaying the ground that is only visible in the window. Also, the rectangle and selection box are only visible in the window as well. These are "ghost" objects, as described in a previous post.