Code Selection Of Text Within A RichTextBox?

How do you code selection of text within a RichTextBox. I tried the following code and nothing happens.I would think this should select all text within the RichTextBox.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.RichTextBox1.SelectAll()
End Sub

I would think this would select text from a start point to an end point.

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
ss = Convert.ToInt16(TextBox1.Text)
se = Convert.ToInt16(TextBox1.Text)
Me.RichTextBox1.Select(ss, se)
End Sub