codice:
Private Sub Command1_Click()
Command2.Enabled = True
Command3.Enabled = True
End Sub

Private Sub Command2_Click()
Command2.Enabled = False
Command3.Enabled = False
End Sub

Private Sub Command3_Click()
Command2.Enabled = False
Command3.Enabled = False
End Sub

Private Sub Form_Load()
Command1.Enabled = True
Command2.Enabled = False
Command3.Enabled = False

End Sub
il codice che hai postato,non fa quello che chiedi