>There is a condition in the txtField class Init():
>
>

>IF TYPE(This.ControlSource)='C'
>   This.InputMask='!'+REPLICATE('X',LEN(EVALUATE(This.ControlSource))-1)
>ENDIF
>

>
>What would be the best approach to update this condition to take care of not executing this code if I have overwrited the value of the InputMask?

You could add a flag to the class to AutoSet the Input Mask.

Add a custom property: AutoSetInputMask
set it's value to .t.

Class Init:

IF TYPE(This.ControlSource)='C' and this.AutoSetInputMask
   This.InputMask='!'+REPLICATE('X',LEN(EVALUATE(This.ControlSource))-1)
ENDIF

Now just set AutoSetInputMask to false and you can make the InputMask whatever you want.