CheckBox Commands
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 Creating a CheckBox         @ <nRow>, <nCol> CHECKBOX [ <oCbx> VAR ] <lVar> ;
 from source code               [ PROMPT <cCaption> ] ;
                                [ OF | WINDOW | DIALOG <oWnd> ] ;
                                [ SIZE <nWidth>, <nHeight> ] ;
                                [ HELPID | HELP ID <nHelpId> ] ;
                                [ FONT <oFont> ] ;
                                [ ON CLICK <uClick> ];
                                [ VALID   <ValidFunc> ]

 Using a CheckBox from       REDEFINE CHECKBOX [ <oCbx> VAR ] <lVar> ;
 a resource Dialog Box          [ ID <nId> ] ;
                                [ OF | WINDOW | DIALOG <oWnd> ] ;
                                [ HELPID | HELP ID <nHelpId> ] ;
                                [ ON CLICK <uClick> ];
                                [ VALID   <ValidFunc> ]

 <nRow>, <nCol>  The coordinates of the CheckBox. We simulate text coordinates.

 <oCbx>          A reference to the CheckBox Object.

 <lVar>          The logical variable to be managed by the CheckBox.

 <cCaption>      The label of the CheckBox

 <oWnd>          A reference to the container Window of the CheckBox.

 <nWidth>,       The dimensions of the CheckBox in pixels.
 <nHeight>

 <nHelpId>       The help topic value of the CheckBox.

 <oFont>         A reference to the Font Object to be used with the CheckBox.

 <uClick>        An action to be performed when the CheckBox changes is
                 clicked.

 <ValidFunc>     An expression or function to be validated wheh the
                 CheckBox looses its focus.

 <nId>           The numeric identifier of the resource CheckBox.