Excel RTD, needs a pop up if data updates

I have been using thinkorswim RTD for excel. Everything works well, except I like to get some sort of pop up notification if RTD data in a cell changes. I found some simple code off the web, it works for regular data change but not for RTD. It can't detect RTD changes with below code. Any ideas without doing something too complicated?

Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "$I$17" Then
MsgBox Target.Value & " " & Target.Offset(0, 1).Value
End If
End Sub

Originally Posted by Bernie Deitrick

You can set up a range to store values so that there is something to compare the new value to when the cell(s) is (are) updated. For example, if column Z is not used, and the RTD data is in cells B2:B10:

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Thank you so much! It worked so well that I couldn't stop the pop up from popping up! lol.