>How about adding backspace to the class? (you know, the calculator does have backspace capability)
>
>CASE nKeyCode = 127
>* backspace
>NODEFAULT
>lSize = LEN(THIS.cSoFar)
>THIS.cSoFar = substr(THIS.cSoFar,1,lSize-1)

Why not LEFT(this.cSoFar, lSize-1) ?

>THIS.SetValue()
>
>And add nKeyCode 13 (for keypress Enter) in the INLIST() for default behavior?
>
>By the way, you referred this class as txtCalculator but I found this classed as txtNumber (for those who are curious and want to check this class out).