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The getContents Smalltalk event occurs when a list box is
created. Smalltalk responds by sending an initializeListBox:
message to the CalorieViewManager instance.
To do its work, the initializeListBox: callback method must first
obtain a list of foods. In preparation, you define the Food class
as in Segment 455, you employ the file-reading program shown in
Segment 456, and you define tCalories as in
Segment 236.