Hiding/Showing controlson a continuous form

I have a form that is set to "continuous forms" view.
Several rows of data are shown to the user at the same time.

I want to set FieldX and FieldY to true and show them only if the
txtEmailAddress control is not null and contains an address.

Some rows shown in the detail section of the form will have email
addresses, some will not.  If a row doesn't have an email address,
FieldX & Y's visible property must be set to false.

I tried this on the "Click" event of the Detail Row, but it sets FieldX
& Y to true for all rows, even those that contain an email address:

If not isnull(txtEmailAddress) then
   'email address present; show the fields
   FieldX.visible = True
   FieldY.visible = True
else
   'email address absent; hide the fields
   FieldX.visible = False
   FieldY.visible = False
EndIf

I'm not sure, but is there a way to do this at the column level back in
the table?

Thnx....

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