ms access - Entering a zero-length string into a form -

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i have form 2 fields (a , b). b designed show after have entered data a. want able enter a. access not allow me - b not show if press enter on keyboard field (a zero-length string). can fix this? have used code below:

private sub a_afterupdate() if = "" b.visible = true else b.visible = true end if end sub

i guess have in mind:

private sub a_afterupdate()      b.visible = not isnull(a.value)  end sub

and cannot "type" null value. leave textbox empty.


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