[AccessD] Changing Rowsource for Graph (Sproc source)

Group,

Access XP ADP

I have a report that has a single graph on it (Unbound Object Frame: 
Microsoft Graph Chart).  The RowSource property is set to a sproc 
which has parameters.

If I enter the following direct into the RowSource property the 
report runs fine:
EXEC sprptPipeGateForecastMth 1085207198, '2006-11-01', '2007-10-01'

However, I want to set the parameters based on values on a form.  The 
help I found on the internet said that the reports OnOpen event was 
the place to put it so I added:

Me!graGraph.RowSource = "EXEC sprptPipeGateForecastMth " & 
[Forms]![frmPipeWeldForecast]!cboGateIDNo & ", '" & 
basConvertDate(basFirstMthDay([Forms]![frmPipeWeldForecast]![txtGateMthStartMth])) 
& "', '" & 
basConvertDate(basFirstMthDay([Forms]![frmPipeWeldForecast]![txtGateMthEndMth])) 
& "'"

When the report is run I get Runtime Error 2455 - You entered an 
expression that has an invalid reference to the property 
RowSource.  I get the same error if I try in the OnOpen event of the 
report (this indicates that the property is not even available OnOpen):

MsgBox Reports!rptPipeGateForecastMth!graGraph.RowSource

I know the property exists because the following works it I put it 
into the report detail OnFormat event:
MsgBox Me!graGraph.RowSource

I have tried setting the property on the detail OnFormat event but an 
error comes up saying that you cant set this property after printing 
has started.

Any guidance on what I can try?