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sBlock (Assignable)
Contains an optional code block that, when present, is evaluated each
time the PushButton object's state changes. The code block takes no
implicit arguments. Use the PushButton:buffer variable to determine
if the push button is pressed or released. A value of true (.T.)
indicates that it is being pressed; otherwise a value of false (.F.)
indicates that it is being released.
This code block is included in the PushButton class to provide a
method of indicating when a state change event has occurred. The
name "sBlock" refers to state block.
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