>>>Alright, you've cut down my code a bit :-)
>>>
>>>But what do you mean by && I hope this.Value is not for CheckBox ?
>>
>>Because If this.Value is direct test for logical value. I assumed that .nOpCode is the CheckBox in question.
>
>.nOpCode is a form prop to hold the Operator code either returned from the combo or input at the text box.

Then the code should be:

With Thisform
     .txtOperator.enabled    = EMPTY(this.Value)
     .cboOperators.enabled   = EMPTY(this.Value)
     .lValidOp		     = EMPTY(this.Value) OR .nOpCode
     .lmEnablePrint()
EndWith

:o)