public event TabControlCancelEventHandler TabPinnedChanging

public void CreateTabControlPinnedTabs()
{
    // Create a GcTabControl.
    GcTabControl gcTabControl = new GcTabControl();

    // Set the size and location of gcTabControl.
    gcTabControl.Size = new Size(200, 200);
    gcTabControl.Location = new Point(10, 10);

    // Add some tab pages to gcTabControl.
    gcTabControl.TabPages.AddRange(new GcTabPage[]
    { 
        new GcTabPage("page1"),
        new GcTabPage("page2"),
        new GcTabPage("page3"),
        new GcTabPage("page4"),
    });

    // Handle the TabPinnedChanged event.
    gcTabControl.TabPinnedChanged += new Containers.TabControlEventHandler(gcTabControl_TabPinnedChanged);

    // Allow to pin or unpin tab by context menu or drag-drop.
    gcTabControl.ShowPinnedContextMenu = true;
    gcTabControl.AllowDragDrop = true;
    gcTabControl.AllowDragToPinTab = true;
    gcTabControl.AllowDragToUnpinTab = true;

    // Set the style for pinned tabs.
    gcTabControl.PinnedStyle.ForeColor = Color.Red;

    // Pin a tab.
    gcTabControl.TabPages[3].IsPinned = true;

    this.Controls.Add(gcTabControl);
}

private void gcTabControl_TabPinnedChanged(object sender, Containers.TabControlEventArgs e)
{
    // Change the text of tab.
    if (e.Action == Containers.TabControlAction.Pinned)
    {
        e.TabPage.Text += "_Pinned";
    }
    else if (e.Action == Containers.TabControlAction.Unpinned)
    {
        e.TabPage.Text = e.TabPage.Text.Substring(0, 5);
    }
}