[RESOLVED] Selectively prevent a combobox from scrolling past a certain point Visual Studio 2012

[oldGMtireman]

I have two combo boxes on a form.




Both of them contain the letters A - Z. One is loaded foreword (A-Z), the other backward (Z-A).

They also hold the asterisk (*) symbol. They each have 26 indexes (not counting -1).

Currently when a checkbox is checked, the asterisk symbol is selected for both combo boxes and they are disabled - works great.

If the checkbox is NOT checked, I would like to prevent the user from scrolling to that "*" symbol using the UP/DOWN arrows
of the combo box control.

In summary: I only want the checkbox to select that indexed item.

I tried to manually add and remove the "*" but the value where the asterisk is added is changed - I don't want that.

Here is the checkbox code:

Private Sub Rnd_Letters_CheckedChanged(sender As Object, e As EventArgs) Handles Rnd_Letters.CheckedChanged
        Rnd_Letters.Font = IIf(Rnd_Letters.Checked = True, New Font(Rnd_Letters.Font, FontStyle.Bold), New Font(Rnd_Letters.Font, FontStyle.Regular))
        ConfigSet = True

        If Rnd_Letters.Checked = False Then
            Rnd_Letters.Refresh()
            ComboBox1.Enabled = True
            ComboBox2.Enabled = True
            ComboBox1.SelectedIndex = 0         ' Shows the first letter in the combobox
            ComboBox1.Refresh()
            ComboBox2.SelectedIndex = 0         ' Shows the first letter in the combobox
            ComboBox2.Refresh()
            No_Repeats.Checked = False
            No_Repeats.Enabled = False
            RndSet = False
        ElseIf Rnd_Letters.Checked = True Then
            No_Repeats.Enabled = True
            RndSet = True
            ComboBox1.SelectedIndex = 26        ' Selects the * symbol
            ComboBox1.Enabled = False
            ComboBox2.SelectedIndex = 26        ' Selects the * symbol
            ComboBox2.Enabled = False
            TextBox1.Text = "0"
        End If

        ConfigSet = False
        Check_Defaults()
        OKToolStripMenuItem.Enabled = True
        SAVEToolStripMenuItem.Enabled = True
    End Sub