Comment 3 for bug 180006

Sounds more like a workaround than a fix. I don't know what the Pin dialog is for, it makes the OK button into an Execute, but it doesn't do anything in the current build, like update the preview. The name doesn't give an indication either.
Obviously both tick boxes are broken, otherwise it's just bad UI.
I'd expect the Preview to go off once the tickbox is unchecked, like in every other program and webpage I can think of. That's how they work, it's a toggle button.