TextBox losing focus
===

This is baffling me. I have a Windows Form with a TextBox, 2 RadioButtons, an OK Button & a Cancel Button. I was mucking around with Tabbing, but I have now removed it, so TextBox1 is set to TabIndex=1 & TabStop=True, all the other fields are set to TabIndex=0 & TabStop=False.

To get to this Form,I execute the following code :

        Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ChooseLeague.SelectedIndexChanged
        If ChooseLeague.SelectedIndex = 0 Then
            Me.Hide()
            MaintainDatabaseAddLeague.RadioButton1.Checked = False
            MaintainDatabaseAddLeague.RadioButton2.Checked = False
            MaintainDatabaseAddLeague.TextBox1.Text = ""
            MaintainDatabaseAddLeague.TextBox1.Focus()
            MaintainDatabaseAddLeague.Show()
        End If
    End Sub

The Form opens and the cursor is blinking in the TextBox as required. However, if I cancel from the Form & then go back into it via the same method, the cursor is NOT in the TextBox and the Cancel Button is highlighted / has Focus.

Why is this, any ideas ?!?