Hiding Tabs

Simply remove the TabPage from the TabControl.TabPages collection. If you want to re-add it later, simply squirrel away a copy in a member variable of your Form (or elsewhere).
public class MainForm : Form {
private List<TabPage> m_tabs = new List<TabPage>();

protected override void OnLoad(EventArgs e) {
foreach(TabPage tab in mainTabControl.TabPages) {
m_tabs.Add(tab);
}
}

private void HideTab(int index) {
mainTabControl.TabPages.RemoveAt(index);
}

private void ShowTab(int tabIndex, int position) {
mainTabControl.TabPages.Insert(position, m_tabs[tabIndex]);
}

// additional code
}

N.B. You'll have to keep your indices straight between the List<TabPage> and TabControl.TabPages. You may want to consider manipulating the tabs by tab name and keeping them in a Dictionary<string,TabPage> instead.

Thanks for the idea. Would it be possible to post a Visual Basic equivalent?

Many thanks for your prompt reply.