A radio button is a tri-state button. Normally, it is either TRUE
or FALSE; a third state MAYBE may be set to indicate that
no selection has been made yet by the user, or that the state is ambiguous.
Events
The following messages are sent by FXRadioButton to its target:
SEL_COMMAND: | sent when the radio button is pressed.
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SEL_KEYPRESS: | sent when a key goes down; the message data is an FXEvent instance.
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SEL_KEYRELEASE: | sent when a key goes up; the message data is an FXEvent instance.
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SEL_LEFTBUTTONPRESS: | sent when the left mouse button goes down; the message data is an FXEvent instance.
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SEL_LEFTBUTTONRELEASE: | sent when the left mouse button goes up; the message data is an FXEvent instance.
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RadioButton flags
RADIOBUTTON_AUTOGRAY: | Automatically gray out when not updated
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RADIOBUTTON_AUTOHIDE: | Automatically hide when not updated
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RADIOBUTTON_NORMAL: | JUSTIFY_NORMAL|ICON_BEFORE_TEXT
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