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public class ShieldLink : Button
{
    private const int BS_COMMANDLINK = 0x0000000E;
    private const uint BCM_SETNOTE = 0x00001609;
    private const uint BCM_SETSHIELD = 0x0000160C;

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern IntPtr SendMessage(HandleRef hWnd, UInt32 Msg,
                              IntPtr wParam, string lParam);
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern IntPtr SendMessage(HandleRef hWnd, UInt32 Msg,
                              IntPtr wParam, IntPtr lParam);

    public ShieldLink()
    {
        this.FlatStyle = FlatStyle.System;
    }

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

    private string _textNote;
    public string TextNote
    {
        get 
        { 
            return _textNote; 
        }
        set 
        { 
            _textNote = value; 
            SendMessage(new HandleRef(this, this.Handle), BCM_SETNOTE,
                                                   IntPtr.Zero, value);
        }
    }

    private bool _showShield;
    public bool ShowShield
    {
        get 
        { 
            return _showShield; 
        }
        set
        {
            _showShield = value;
            SendMessage(new HandleRef(this, this.Handle), 
                BCM_SETSHIELD, IntPtr.Zero, new IntPtr(value ? 1 : 0));
        }
    }
}