C# Vista Command Link Control with Windows Forms

using System;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Drawing;
using System.ComponentModel;namespace Vista.Controls
{
    public class CommandLink : Button
    {
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        unsafe static extern IntPtr SendMessage(HandleRef hWnd, uint Msg, void* wParam, void* lParam);

        const int BS_CENTER = 0x00000300;
        const int BS_COMMANDLINK = 0x0000000E;
        const int BS_DEFCOMMANDLINK = 0x0000000F;

        const uint BCM_SETNOTE = 0x00001609;
        const uint BCM_GETNOTE = 0x0000160A;
        const uint BCM_GETNOTELENGTH = 0x0000160B;
        const uint BCM_SETSHIELD = 0x0000160C;

        public XButton()
        {
            //this.FlatStyle = FlatStyle.System;
        }

        protected override Size DefaultSize
        {
            get
            {
                return new Size(, );
            }
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cParams = base.CreateParams;
                cParams.Style |= BS_COMMANDLINK;
                return cParams;
            }
        }

        private bool _shield = false;

        [Category("Command Link"),
         Description("Gets or sets the shield icon visibility of the command link."),
         DefaultValue(false)]
        public unsafe bool Shield
        {
            get
 　　　　　　 {
　　　　　　　　　 return _shield;
　　　　　　　}
            set
            {
                _shield = value;
                SendMessage(new HandleRef(this, Handle), BCM_SETSHIELD, null, &value);
            }
        }

        [Category("Command Link"),
         Description("Gets or sets the note text of the command link."),
         DefaultValue("")]
        public string Note
        {
            get
            {
                return GetNoteText();
            }
            set
            {
                SetNoteText(value);
            }
        }

        private unsafe void SetNoteText(string value)
        {
            fixed (char* lpStr = value)
            {
                SendMessage(new HandleRef(this, Handle), BCM_SETNOTE, null, lpStr);
            }
        }

        private unsafe string GetNoteText()
        {
            int dwLength = (int)SendMessage(new HandleRef(this, Handle), BCM_GETNOTELENGTH, null, null) + ;
            char* lpStr = stackalloc char[dwLength];
            SendMessage(new HandleRef(this, Handle), BCM_GETNOTE, &dwLength, lpStr);
            return new string(lpStr);
        }

    }
}