MSAccess ObjectFrame properties appearing "sometime later"

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I have a VBA script in MSAccess 2003 and I'm having some problems. Within the report's open event I'm trying to adjust a MSGraph.Chart's RowSource property. This sometimes works and sometimes doesn't.

The problem occurs with the assignment line "Graph32.RowSource"... the application raises error# 2455. If I play around with the watches (not changing values, just changing what I'm watching) in the debugger and hit run a few times, the assignment will just work with the adjusted RowSource.

Any ideas why it is taking time to get the properties?

The script:

Private Sub Report_Open(Cancel As Integer)
Dim rs As Recordset
Dim fldNumb As Integer
Dim sqlReq As String

Set rs = Application.CurrentDb.OpenRecordset("Question Averages Labelled_Crosstab")
sqlReq = ""

For fldNumb = 2 To rs.Fields.Count - 1
    sqlReq = sqlReq & ",[" & rs.Fields(fldNumb).Name & "]"
Next fldNumb

rs.Close

sqlReq$ = "SELECT Null AS Expr " & sqlReq$ & " FROM [Question Averages Labelled_Crosstab];"
Graph32.RowSource = sqlReq
End Sub