coloca una barra de herramientas y colocas tres botones un para la derecha, centrada, izquierda y les colocas es te codigo si tienes de das es es mi pagina vcarrillo@live.com.

Private Sub btbarAlinIzda_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btbarAlinIzda.Click
rtbText.SelectionAlignment = HorizontalAlignment.Left
btbarAlinIzda.Checked = True
btbarAlinCentrada.Checked = False
btbarAlinDcha.Checked = False
End Sub

Private Sub btbarAlinCentrada_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btbarAlinCentrada.Click
rtbText.SelectionAlignment = HorizontalAlignment.Center
btbarAlinIzda.Checked = False
btbarAlinCentrada.Checked = True
btbarAlinDcha.Checked = False
End Sub

Private Sub btbarAlinDcha_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btbarAlinDcha.Click
rtbText.SelectionAlignment = HorizontalAlignment.Right
btbarAlinIzda.Checked = False
btbarAlinCentrada.Checked = False
btbarAlinDcha.Checked = True
End Sub

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