■ Custom controls extend the set of standard controls
   available in Visual Basic for MS-DOS. You access this
   custom-control functionality in Visual Basic via custom-
   control libraries (.LIB) and Quick libraries (.QLB).
 
 ■ Like standard controls, custom controls recognize a
   predefined set of properties, events, and methods.
   For more information on the specific features and
   functionality of a custom control, refer to the
   documentation that came with the control.
 
 ■ For more information on using custom controls, see
   Chapter 19 in the "Programmer's Guide."
 
 ■ For more information on creating custom controls,
   see Chapter 1 of "Professional Features"
   (Professional Edition only).