public static MachineOp FirstMOP(this CADFile file)
        {
            CAMPart part = file.FirstPart();

            return(part != null?part.FirstMOP() : null);
        }
        public static ToolDefinition FirstTool(this CADFile file)
        {
            CAMPart part = file.FirstPart();

            return(part != null?part.FirstTool() : null);
        }
        public static CAMPart FirstPart(this ICADView view)
        {
            CADFile file = view.CADFile;

            return(file != null?file.FirstPart() : null);
        }