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Here is code that implements a ToolTip with multiple lines

Language:VB.NET

Private Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long

Private Declare Function SetWindowPos Lib "user32" (ByVal hWnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Private Declare Function GetClientRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT) As Long

Private Declare Function DestroyWindow Lib "user32" (ByVal hWnd As Long) As Long

Private Type RECT

Left As Long

Top As Long

Right As Long

Bottom As Long

End Type

Private Type TOOLINFO

cbSize As Long

uFlags As Long

hWnd As Long

uid As Long

RECT As RECT

hinst As Long

lpszText As String

lParam As Long

End Type

Private Const CW_USEDEFAULT = &H80000000

Private Const SWP_NOMOVE = &H2

Private Const SWP_NOACTIVATE = &H10

Private Const SWP_NOSIZE = &H1

Private Const HWND_NOTOPMOST = -2

Private Const HWND_TOP = 0

Private Const HWND_TOPMOST = -1

Private Const HWND_BOTTOM = 1

Private Const WS_POPUP = &H80000000

Private Const WS_EX_TOPMOST = &H8&

Private Const WM_USER = &H400

Private Const TTDT_AUTOMATIC = 0

Private Const TTDT_AUTOPOP = 2

Private Const TTDT_INITIAL = 3

Private Const TTDT_RESHOW = 1

' All of the flags for tool tip windows.

Private Const TTF_ABSOLUTE = &H80

Private Const TTF_CENTERTIP = &H2

Private Const TTF_DI_SETITEM = &H8000

Private Const TTF_IDISHWND = &H1

Private Const TTF_RTLREADING = &H4

Private Const TTF_SUBCLASS = &H10

Private Const TTF_TRACK = &H20

Private Const TTF_TRANSPARENT = &H100

' All of the available messages for tool tip windows.

Private Const TTM_ACTIVATE = (WM_USER + 1)

Private Const TTM_ADDTOOLA = (WM_USER + 4)

Private Const TTM_ADDTOOLW = (WM_USER + 50)

Private Const TTM_ADJUSTRECT = (WM_USER + 31)

Private Const TTM_DELTOOLA = (WM_USER + 5)

Private Const TTM_DELTOOLW = (WM_USER + 51)

Private Const TTM_ENUMTOOLSA = (WM_USER + 14)

Private Const TTM_ENUMTOOLSW = (WM_USER + 58)

Private Const TTM_GETBUBBLESIZE = (WM_USER + 30)

Private Const TTM_GETCURRENTTOOLA = (WM_USER + 15)

Private Const TTM_GETCURRENTTOOLW = (WM_USER + 59)

Private Const TTM_GETDELAYTIME = (WM_USER + 21)

Private Const TTM_GETMARGIN = (WM_USER + 27)

Private Const TTM_GETMAXTIPWIDTH = (WM_USER + 25)

Private Const TTM_GETTEXTA = (WM_USER + 11)

Private Const TTM_GETTEXTW = (WM_USER + 56)

Private Const TTM_GETTIPBKCOLOR = (WM_USER + 22)

Private Const TTM_GETTIPTEXTCOLOR = (WM_USER + 23)

Private Const TTM_GETTOOLCOUNT = (WM_USER + 13)

Private Const TTM_GETTOOLINFOA = (WM_USER + 8)

Private Const TTM_GETTOOLINFOW = (WM_USER + 53)

Private Const TTM_HITTESTA = (WM_USER + 10)

Private Const TTM_HITTESTW = (WM_USER + 55)

Private Const TTM_NEWTOOLRECTA = (WM_USER + 6)

Private Const TTM_NEWTOOLRECTW = (WM_USER + 52)

Private Const TTM_POP = (WM_USER + 28)

Private Const TTM_RELAYEVENT = (WM_USER + 7)

Private Const TTM_SETDELAYTIME = (WM_USER + 3)

Private Const TTM_SETMARGIN = (WM_USER + 26)

Private Const TTM_SETMAXTIPWIDTH = (WM_USER + 24)

Private Const TTM_SETTIPBKCOLOR = (WM_USER + 19)

Private Const TTM_SETTIPTEXTCOLOR = (WM_USER + 20)

Private Const TTM_SETTITLEA = (WM_USER + 32)

Private Const TTM_SETTITLEW = (WM_USER + 33)

Private Const TTM_SETTOOLINFOA = (WM_USER + 9)

Private Const TTM_SETTOOLINFOW = (WM_USER + 54)

Private Const TTM_TRACKACTIVATE = (WM_USER + 17)

Private Const TTM_TRACKPOSITION = (WM_USER + 18)

Private Const TTM_UPDATE = (WM_USER + 29)

Private Const TTM_UPDATETIPTEXTA = (WM_USER + 12)

Private Const TTM_UPDATETIPTEXTW = (WM_USER + 57)

Private Const TTM_WINDOWFROMPOINT = (WM_USER + 16)

Private Const TTS_ALWAYSTIP = &H1

'

Private Const TTS_BALLOON = &H40

'

Private Const TTS_NOANIMATE = &H10

'

Private Const TTS_NOFADE = &H20

'

Private Const TTS_NOPREFIX = &H2

Private Const TOOLTIPS_CLASS = "tooltips_class"

Private Const TOOLTIPS_CLASSA = "tooltips_class32"

Public Sub DisplayTooltip(ControlHandle As Long, TooltipText As String, ApphInstance As Long)

Dim ti As TOOLINFO

Dim RECT As RECT

Dim uid As Long

uid = 0

Dim strPntr As String

strPntr = TooltipText

Dim RetVal As Long

hwndTT = CreateWindowEx(WS_EX_TOPMOST, TOOLTIPS_CLASSA, vbNullString, WS_POPUP Or TTS_NOPREFIX Or TTS_BALLOON, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, ControlHandle, 0, ApphInstance, 0)

SetWindowPos hwndTT, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE Or SWP_NOACTIVATE

GetClientRect ControlHandle, RECT

ti.cbSize = Len(ti)

ti.uFlags = TTF_CENTERTIP Or TTF_SUBCLASS

'

' The hwnd of the control having the tool tip applied.

ti.hWnd = ControlHandle

'

ti.hinst = ApphInstance

'

ti.uid = uid

ti.lpszText = strPntr

ti.RECT.Left = RECT.Left

ti.RECT.Top = RECT.Top

ti.RECT.Right = RECT.Right

ti.RECT.Bottom = RECT.Bottom

RetVal = SendMessage(hwndTT, TTM_ADDTOOLA, 0, ti)

RetVal = SendMessage(hwndTT, TTM_SETMAXTIPWIDTH, 0, 80)

RetVal = SendMessage(hwndTT, TTM_SETTIPBKCOLOR, RGB(247, 252, 203), 0) 'cream

RetVal = SendMessage(hwndTT, TTM_SETTIPTEXTCOLOR, RGB(0, 0, 0), 0)

RetVal = SendMessage(hwndTT, TTM_UPDATETIPTEXTA, 0, ti)

End Sub

Good Luck!

Bonne Chance!