I have six .NET 2.0 MaskedTextBoxes in a user control (With a mask on each
of 3 numeric characters).  When the length of the text in the right-most
masked textbox is 0, I want to put the cursor at the end of the previous
(5th) masked textbox.  I've tried the following:

       Private Sub mtb6_TextChanged(ByVal sender As Object, ByVal e As
System.EventArgs) Handles mtb6.TextChanged
           Select Case Me.mtb6.Text.Length
               Case Me.intMaxEntryLength
                   Exit Select
               Case 0
                   Me.mtb5.SelectionStart = Me.mtb5.Text.Length
                   Me.mtb5.Focus()
               Case Else
                   Exit Select
           End Select
       End Sub

All I ever get, regardless of where I set the SelectionStart property, is
the cursor showing up between the 1st and 2nd character.  As I would
suspect, if I set the SelectionStart property to -1, I get an exception.
However, If I set the SelectionStart property to some absurd number (say
43465491651), I get the same results (i.e. between the 1st and 2nd
character).

Is this a problem with the control, or just my implementation of it?

Regards,

Jason.