TV_button.cpp This module defines a "button" object for use with the TV window interface. Modification history: V00.00 Kevin McGuire October 23, 1991 Original V00.01 James Holt February 28, 1992 Add window id and pointer to pass user data. V00.02 Andrew Braun February 29, 1996 Added physical-to virtual column mapping in redraw V00.03 Andrew Braun October 7. 1996 Corrected discrepancies between prototypes and descriptions of many of the methods. Didn't change any code.