An FXGroupBox widget provides a nice raised
or sunken border around a group of widgets, providing a visual delineation.
Typically, a title is placed over the border to provide some clarification.
Radio buttons placed inside a group box automatically assume mutually
exclusive behaviour, i.e. at most one radio button will be checked at any
one time.
Group box options
GROUPBOX_TITLE_LEFT: | Title is left-justified
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GROUPBOX_TITLE_CENTER: | Title is centered
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GROUPBOX_TITLE_RIGHT: | Title is right-justified
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GROUPBOX_NORMAL: | same as GROUPBOX_TITLE_LEFT
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