For me, I found it easier to get the layout I want by packing groups of things into separate frames, e.g., for the checkboxes, I'd just pack a frame to the top, then pack each checkbox to the left in the frame.
Re^2: Tk: pack, grid or place?
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Yes, you are right. Another way is to group related widgets into frames. That's exactly what I did with LaTeX Wizard 708332. Honestly when I finish it I felt I was depending too much on frames, so on the next project I wanted to rely more on my ability to use the pack geometry manager.
Just for practice and fun.... ;-) !!!!
That's how we learn new things.
But Thanks anyway for your comments.