Option group control supported by CXlDialog.
class CXlControlOptionGroup : public CXlControl
The CXlControlOptionGroup class groups together a set of option fields, each represented by a CXlControlOption object.
A group of options should be added to the dialog in a sequential group, and the group must be preceded by a CXlControlOptionGroup control.
The CXlControlOptionGroup object is never displayed, but its position can be used to set the position of the first member option.