Custom ComboBox with permanent items

[dmanhr]

Hi,

I'm developing a control (derived from ComboBox) with permanent items
(First, Previous, Next, Last). So, I'd like it's collection of items couldn't
be changed neither in design time nor programmatically.

public class Navigator: ComboBox {
Navigator() {
IntializeComponents();
}

private void InitializeComponents() {
this.Item.AddRange(new string[]{"First", "Previous", "Next", "Last"});
this.SelectedItemChanged += new
SelectedIndexChangedEventHandler(ComboBox_Selected IndexChanged);
}

private void ComboBox_SelectedIndexChanged() {
MessageBox.Show(SelectedIndex.ToString());
}
}

What should I do? I thought override Items property, but I couldn't realize
it.
Thanks in advance,
dmanhr