why does a backspace in cTextBoxNumeric make it go whack?

I kludged it to as follows to make client relax with the following in a subclass...

LPARAMETERS nkeycode,nshiftaltctrl

IF nkeycode = 127 &&backspace keycode
     nkeycode = 7 &&simulate delete key instead dammit
ENDIF

DODEFAULT(nkeycode,nshiftaltctrl)

is it friday yet?