[About The Guide]
Contains an optional code block that, when present, is evaluated each
time the RadioGroup object receives or loses input focus. The code
block takes no implicit arguments. Use the RadioGroup:hasFocus
instance variable to determine if the radio group is receiving or
losing input focus. A value of true (.T.) indicates that it is
receiving input focus; otherwise, a value of false (.F.) indicates
that it is losing input focus.
This code block is included in the RadioGroup class to provide a
method of indicating when an input focus change event has occurred.
The name "fBlock" refers to focus block.
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Written by Dave Pearson