I see Stanford's CS1993P lecture with iTunes U and the first demo has been a calculator. In the second lecture, the professor uses a black grid line to align the bottom edge button of the displayed label. How can I enable this grid line, so I know that my buttons are directly below the label?
I'm the only issue I just change the size of the label to remove the previous fixes and It manually sets the height value: 38 and the blue line appears. 
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