Forms and Code Pages

I created a code page that displays a graph. It is embedded in a form but it only works new form style and not the old/legacy form style

Formula url: URLRoot() & "db/"& AppID() &"?a=dbpage&pagename=graph_only_run_chart.html" & "&related_chart=" & [Record ID#])

It seems that the url for the code page works everywhere except for when its embedded within the old/legacy form.

The code page when embedded in the old style gives a 'QB API ERROR: Error: Request failed with status code 500' 

Any thoughts?