I'm using VFP 6.0 on Windows 98

I have a form with a one-column grid and a "Command Button"

I wrote in the "form1.grid1.column1.text1.valid," RETURN .F.
On the "Command Button.Click" I wrote THISFORM.RELEASE()

My problem is although the grid fires FALSE on it's Column.Text1.VALID, it looses focus and the form is released
Is it a Bug? Or what I can do?

Thanks in advance