Antonio,

You can work through the controls collection and check the TabIndex property for each one until you find the one where TabIndex is 1.

FOR EACH oCont IN Thisform.Controls
    IF oCont.TabIndex = 1
       oCont.SetFocus()
       EXIT
    ENDIF
ENDFOR

You may need to use PEMSTATUS() to insure that the control you are looking at has a TabIndex property.