@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: In writing your tool tip notification handler, you need to use the TOOLTIPTEXT structure. The members of the TOOLTIPTEXT !!!!C# Definition: [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)] struct TOOLTIPTEXT { public NMHDR hdr; public IntPtr lpszText; [MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)] public string szText; public IntPtr hinst; public int uFlags; } // ANSI version of the structure. [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)] struct TOOLTIPTEXTA { public NMHDR hdr; public IntPtr lpszText; [MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)] public string szText; public IntPtr hinst; public int uFlags; } !!!!VB Definition: <StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)> _ Structure TOOLTIPTEXT Public hdr As NMHDR Public lpszText As IntPtr <MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)> _ Public szText As String Public hinst As IntPtr Public uFlags As Integer End Structure ' ANSI version of the structure. <StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)> _ Structure TOOLTIPTEXTA Public hdr As NMHDR Public lpszText As IntPtr <MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)> _ Public szText As String Public hinst As IntPtr Public uFlags As Integer End Structure Documentation: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/HTML/_core_the_tooltiptext_structure.asp
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