制作类似VS多选项卡的窗体布局控件

public partial class JcsFormHeader : UserControl
{
public JcsFormHeader()
{
    InitializeComponent();
    SetStyle(ControlStyles.UserPaint, true);
    SetStyle(ControlStyles.ResizeRedraw, true);
    SetStyle(ControlStyles.AllPaintingInWmPaint, true);
    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
    SetStyle(ControlStyles.Selectable, true);
    this.Height = DEF_HEADER_HEIGHT;
    _list = new List<Form>();
    _menu = new ContextMenuStrip();
    _menu.ItemClicked += new ToolStripItemClickedEventHandler(_menu_ItemClicked);
    _closeButton = new FormCloseButton(render);
    _menuGlyph = new FormMenuGlyph(render);
    _menuGlyph.Bounds = new Rectangle(ClientSize.Width - DEF_GLYPH_WIDTH, 2, 16, 16);
    _closeButton.Bounds = new Rectangle(ClientSize.Width - 20, 2, 16, 16);

    SetDefaultSelected();
}

private ToolStripProfessionalRenderer render = new ToolStripProfessionalRenderer();
private int _defaultStartPosition = 10 ;
private const int DEF_HEADER_HEIGHT = 24;//默认的HEADER的高
private const int DEF_GLYPH_WIDTH = 40;//默认的HEADER的宽
private Rectangle _stripButtonRect = Rectangle.Empty;//Button的区域
private List<Form> _list;
private StringFormat sf = null;//文本布局类型
private ContextMenuStrip _menu;
private FormMenuGlyph _menuGlyph = null;//控制菜单
private FormCloseButton _closeButton = null;//关闭按钮

//private TabLeftMoveButton LeftmoveButton = null;//左移动按钮
private Form _selectedForm = null;
private Form _firstForm = null;
private bool _showMenu = true;
private bool _showClose = true;

public enum HitTestResult
{
    CloseButton,//关闭按钮
    MenuGlyph,//控制菜单
    LeftMoveButton,
    RightMoveButton,
    Form,//ITEM
    None//其他任何地区
}

public Form SelectedForm
{
    get { return _selectedForm; }
    set
    {
 if (_selectedForm != value)
 {
     //if(_selectedForm!=null)
     //   _selectedForm.SendToBack();
     _selectedForm = value;
    
     this.Invalidate();
     //_selectedForm.Show();
     _selectedForm.BringToFront();
 }
    }
}