class MultyPagePanel : Panel
{
  private int _currentPageIndex;
  public int CurrentPageIndex
  {
    get { return _currentPageIndex; }
    set
    {
      if (value >= 0 && value < (Controls.Count - 1))
      {
        Controls[value].BringToFront();
        _currentPageIndex = value;
      }
    }
  }

  public void AddPage(Control page)
  {
    Controls.Add(page);
    page.Dock = DockStyle.Fill;
  }
}

MultyPagePanel p;

// MyTabPage is a Control derived class that represents one page on your form.
MyTabPage page = new MyTabPage();
p.AddPage(page);

p.CurrentPageIndex = 0;

using System;
using System.Windows.Forms;

class TablessControl : TabControl {
  protected override void WndProc(ref Message m) {
    // Hide tabs by trapping the TCM_ADJUSTRECT message
    if (m.Msg == 0x1328 && !DesignMode) m.Result = (IntPtr)1;
    else base.WndProc(ref m);
  }
}

tcActionControls.Region = new Region(new RectangleF(
             tbPageToShow.Left,
               tbPageToShow.Top,
                 tbPageToShow.Width,
                    tbPageToShow.Height)
);

public partial class TabControlWithoutHeader: TabControl
{
    public TabControlWithoutHeader()
    {
        InitializeComponent();
    }

    protected override void WndProc(ref Message m)
    {
    if (m.Msg == 0x1328 && !DesignMode)
        m.Result = (IntPtr)1;
    else
        base.WndProc(ref m);
    }
}