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Option Explicit 'Declare the API function call. 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 ' Add API constant Private Const LB_ITEMFROMPOINT = &H1A9 Next, add some code to the form load event to fill the ListBox with data: Private Sub Form_Load() ' load some items in the list box With List1 .AddItem "Red" .AddItem "Yellow" .AddItem "Blue" End With End Sub Finally, in the MouseMove event of the ListBox, put the following code: Private Sub List1_MouseMove(Button As Integer, Shift As Integer, _ X As Single, Y As Single) ' present related tip message Dim lXPoint As Long, lYPoint As Long, lIndex As Long If Button = 0 Then ' if no button was pressed lXPoint = CLng(X / Screen.TwipsPerPixelX) lYPoint = CLng(Y / Screen.TwipsPerPixelY) With List1 ' get selected item from list lIndex = SendMessage(.hwnd, _ LB_ITEMFROMPOINT, _ 0, _ ByVal ((lYPoint * 65536) + lXPoint)) ' show tip or clear last one If (lIndex >= 0) And (lIndex <= .ListCount) Then .ToolTipText = .List(lIndex) Else .ToolTipText = "" End If End With End If End Sub
