In this video: Adding instructions to the LabelHeader for editing an assertion.
Getting an Entry and some Buttons to grid on top of the assertion Label if the Label is double-clicked.
Adding commands to the Buttons.
Trying to get the edit row frame to overlap other widgets by using the `place()` geometry manager instead of `grid()` or `pack()`.
The problem was solved by gridding the edit row frame on top of the double-clicked Label instead of inside it.
