How do you pass the aditional paramaters? when I go look at the RenderChart function source I see this 
 
   	Public Shared Function RenderChart(ByVal chartSWF As String, ByVal strURL As String, ByVal strXML As String, ByVal chartId As String, ByVal chartWidth As String, ByVal chartHeight As String, ByVal debugMode As Boolean, ByVal registerWithJS As Boolean) As String
       	Dim builder As StringBuilder = New StringBuilder
       	builder.AppendFormat(("<div id='{0}Div' align='center'>" & Environment.NewLine), chartId)
       	builder.Append(("Chart." & Environment.NewLine))
       	builder.Append(("</div>" & Environment.NewLine))
       	builder.Append(("<script type=""text/javascript"">" & Environment.NewLine))
       	builder.AppendFormat(("var chart_{0} = new FusionCharts(""{1}"", ""{0}"", ""{2}"", ""{3}"", ""{4}"", ""{5}"");" & Environment.NewLine), chartId, chartSWF, chartWidth, chartHeight, boolToNum(debugMode), boolToNum(registerWithJS))
       	If (strXML.Length = 0) Then
           	builder.AppendFormat(("chart_{0}.setDataURL(""{1}"");" & Environment.NewLine), chartId, strURL)
       	Else
           	builder.AppendFormat(("chart_{0}.setDataXML(""{1}"");" & Environment.NewLine), chartId, strXML)
       	End If
       	builder.AppendFormat(("chart_{0}.render(""{1}Div"");" & Environment.NewLine), chartId, chartId)
       	builder.Append(("</script>" & Environment.NewLine))
       	Return builder.ToString
   	End Function
 
  
There is no parameters after registerWithJS.