I am trying to do the following in VFP 5.0a

In a grid when field 4 of a record is greater than 100 I want the contents of field 2 of the same record not to be visible.

I have tried this:

IF thisForm.Grid1.Column4.Text1.Value > 100
thisForm.Grid1.Column2.Text1.Visible = .F.
ELSE
thisForm.Grid1.Column2.Text1.Visible = .T.
ENDIF

I have placed this code in several places but the field is always visible.

Just for the sake of it I have tried:
This.Visible = .F.
in the refresh of the textbox but it does not even work.

The only thing that works is I change the column2.visible property to .F. then everything is invisible.

So what is the use of this property in the textbox?

Thanks in advance for your help.
Raymond