How to get Excel Chart Title source?

I can set an Excel Chart title to a range or a named range with VBA but if I inqiure I just get the actual value. How to find out what the Title reference is if there is one?

Code:

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    ActiveChart.ChartTitle.Text = "=Test1!R3C10"
    ActiveChart.ChartTitle.Text = "=Sheet1!ChtTitle"
    Debug.Print ActiveChart.ChartTitle.Text '==> Derivative

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Code:

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Sub chartit()
    Dim myChart As Chart
    Dim mySheet As Worksheet
   
    Set mySheet = ActiveSheet
    Set myChart = mySheet.ChartObjects(1).Chart
   
    MsgBox myChart.ChartTitle.Formula
   
End Sub

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Thanks. Even though the target platform was MsOf10 (work) I was using MsOf03 (home) for debug. It works OK on MsOf10 but not on MsOf03 (Object doesn't support this property). Any idea how to get chart title formula w/ MsOf03? I'm guessing it's not possible. I see nothing in the object model that would seem to work.