Constructs a CXlControlOptionGroup object
CXlControlOptionGroup( UINT id = -1, int nSel = -1, USHORT x = 0, USHORT y = 0 );
Numeric identifier of the control, which can be used to refer to it in event handlers. The ID does not need to be unique.
Zero-based index of the initially selected option.
Coordinate of left side of control. Ignored if 0.
Coordinate of top of control. Ignored if 0.
This constructor creates a option group.