.NET Shell Extensions - Shell Info Tip Handlers

using System;
using System.Runtime.InteropServices;

namespace SharpShell.Interop
{
    [StructLayout(LayoutKind.Sequential)]
    public struct PROPSHEETPAGE
    {
        public int dwSize;
        public PSP dwFlags;
        public IntPtr hInstance;
        public IntPtr pTemplate;
        public IntPtr hIcon;
        public string pszTitle;
        public DialogProc pfnDlgProc;
        public IntPtr lParam;

        public PropSheetCallback pfnCallback;

        public int pcRefParent;
        public string pszHeaderTitle;
        public string pszHeaderSubTitle;
    }

    [Flags]
    internal enum PSH : uint
    {
        PSH_DEFAULT = 0x00000000,
        PSH_AEROWIZARD = 0x00004000,
        PSH_HASHELP = 0x00000200,
        PSH_HEADER = 0x00080000,
        PSH_HEADERBITMAP = 0x08000000,
        PSH_MODELESS = 0x00000400,
        PSH_NOAPPLYNOW = 0x00000080,
        PSH_NOCONTEXTHELP = 0x02000000,
        PSH_NOMARGIN = 0x10000000,
        PSH_PROPSHEETPAGE = 0x00000008,
        PSH_PROPTITLE = 0x00000001,
        PSH_RESIZABLE = 0x04000000,
        PSH_RTLREADING = 0x00000800,
        PSH_STRETCHWATERMARK = 0x00000008,
        PSH_USECALLBACK = 0x00040000,
        PSH_USEHBMHEADER = 0x00100000,
        PSH_USEHBMWATERMARK = 0x00010000,
        PSH_USEHICON = 0x00000002,
        PSH_USEHPLWATERMARK = 0x00020000,
        PSH_USEICONID = 0x00000004,
        PSH_USEPAGELANG = 0x00200000,
        PSH_USEPSTARTPAGE = 0x00000040,
        PSH_WATERMARK = 0x00008000,
        PSH_WIZARD = 0x00000020,
        PSH_WIZARD97 = 0x00002000,
        PSH_WIZARDCONTEXTHELP = 0x00001000,
        PSH_WIZARDHASFINISH = 0x00000010,
        PSH_WIZARD_LITE = 0x00400000
    }
}