Editing Button Contents
-----------------------
Except for a pop-up button, where each line of a button's contents is an item
in the button's pop-up menu, the contents of a button don't show. But you can
edit the contents either through scripts (using the put command), or through
the Button Contents editor, accessible in the button's Info dialog box. The
contents of a button is always stored unformatted.
Pasting With Data
-----------------
To paste a Clipboard-resident button with its data intact, hold down the Shift
key as you paste (or press command-shift-V), just as you would paste a field
with its text intact.
Button Expressions
------------------
Button expressions evaluate to the button's contents, just as field expressions
evaluate to the contents of the specified field.
This article was adapted from the HyperCard 2.2 New Features stack.