Indicator painter and errors in charting in designer

I'm trying to use a custom indicator in designer and use the indicatorPainter to display it. I assume it can be done, but the helps are not real clear. I have the indicator returning a SingleIndicatorValue<ValuesClass> where ValuesClass is a class that contain the multiple values to chart (values for 6 lines)
In the strategy, I have
ChartElementForIndicatorPainter = new ChartIndicatorElement();
ChartElementForIndicatorPainter.IndicatorPainter = new ValuesClassIndicatorPainter();
This is as far as the help gets me. It doesn't even say where this should go. I added it to the strategy initialization.

In the OnStarted method I add it to the chart
chart.AddElement(area, ChartElementForIndicatorPainter);

But then in the "OnProcess" method, when I call
NewIndicator?.Invoke(indicatorReturn);
It gives me 2 errors.




S#.Designer 5/18/2019 8:54:21 PM +10:00 Error System.InvalidOperationException: The element was already attached to chart before.
at StockSharp.Xaml.Charting.ChartArea.#=z7NgDDY12SFSN.OnAdding(IChartElement #=zqJpzaMY=)
at Ecng.Collections.BaseCollection`2.Add(TItem item)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

HistoryEmulationConnector 12/11/2018 4:40:00 AM +00:00 Error System.InvalidCastException: Can't convert Signaller.Indicators.ValuesClass of type 'Signaller.Indicators.ValuesClass to type 'System.Decimal'. ---> System.ArgumentException: Can't convert Signaller.Indicators.ValuesClass of type 'Signaller.Indicators.ValuesClass to type 'System.Decimal'.
Parameter name: value
at Ecng.Common.Converter.To(Object value, Type destinationType)
--- End of inner exception stack trace ---
at Ecng.Common.Converter.To(Object value, Type destinationType)
at Ecng.Common.Converter.To[T](Object value)
at StockSharp.Xaml.Charting.IndicatorPainters.BaseChartIndicatorPainter.#=z83WVYsU=(ReadOnlyCollection`1 #=zf3x5daU=, Int32 #=zyjj9yeM=)
at StockSharp.Xaml.Charting.IndicatorPainters.BaseChartIndicatorPainter.#=zaW8q4VLX7QUBLKN88WpP1wU=.#=zCjI32oDyepDrpW8skQ==(Int32 #=zojXel4E=)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.<CastIterator>d__97`1.MoveNext()
at System.Linq.Enumerable.<CastIterator>d__97`1.MoveNext()
at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source)
at Ecng.Collections.CollectionHelper.IsEmpty[T](IEnumerable`1 source)
at #=z0DJIOHexY32No9PMDP1u_SU0nCszuBgy288gF$JeKlZt1P1_rnibJ8_nsYN8.#=zywKyUNA=[TX1](IEnumerableEx`1 #=zodDz6VA=)
at StockSharp.Xaml.Charting.IndicatorPainters.BaseChartIndicatorPainter.Draw(ChartDrawData data)
at #=zFL$1bzvYBLQbE9N2Sc32mMXoihonASmdP0sTsIJdrx0tOTDOI_QGtou5$cbR.#=zrbrG0UoScFKf(ChartDrawData #=z7f$H9xY=)
at #=zFL$1bzvYBLQbE9N2Sc32mMXoihonASmdP0sTsIJdrx0tOTDOI_QGtou5$cbR.#=zywKyUNA=(ChartDrawData #=z7f$H9xY=)
at StockSharp.Xaml.Charting.Chart.#=zosvLqDQVWtH9.#=zywKyUNA=(ChartDrawData #=z7f$H9xY=)
at StockSharp.Xaml.Charting.ChartPanel.Draw(ChartDrawData data)
at StockSharp.Xaml.Diagram.Elements.ChartDiagramElement.#=zIVzy6y9XB8CEwFcScKoYbYU=(IChart #=zs6cBqJg=)
at System.Action`1.Invoke(T obj)
at StockSharp.Algo.Connector.OnProcessMessage(Message message)
at StockSharp.Algo.Testing.HistoryEmulationConnector.OnProcessMessage(Message message)

In debugging it externally, it never hits the breakpoints of the indicatorpainter, though I don't know if it ever would anyways. It obviously is not using the painter if it is trying to change the class into a decimal.

Is it possible to use the indicator painter with the designer? How do you hook it up? The helps are pretty sparse about this.