>How do I make to insert a class inside a grid, and to remove Text1?

Manually or programmatically?

If 1:

Select grid, edit, select column you want, on the toolbar click on the desired class. Then go to the properties sheet, select text1, click on form's titlebar and press delete.

Programmatically in run-time:

thisform.grd.Column1.RemoveObject('text1')
thisform.grd.Column1.AddObject('edit1','editbox')
thisform.grd.Column1.edit1.visible = .t.
thisform.grd.Column1.sparse = .f.