[Mono-list] MedSphere Graph

[Panoramix]

I'm trying to create a dynamic trend but, having certainly made some
mistakes, the application crashes after a few cycles.
Carryover below the code, where I made the mistake?

Thanks to all .

using System;
using Gtk;
using Medsphere.Widgets;
using System.Timers;

public partial class MainWindow: Gtk.Window
{
	// creo l'oggetto grafico
	public Graph NuovoGraph = new Medsphere.Widgets.Graph2D();
	// creo una struttura tree per immagazzinare i dati
	public TreeStore store = new TreeStore (typeof (double), typeof (double));
	public TreeStore storeA = new TreeStore (typeof (double), typeof (double));
	public double x=0.0;
	public double y=0.0;
	// dichiaro il timer
	private static System.Timers.Timer ourTimer;
	
	public MainWindow (): base (Gtk.WindowType.Toplevel)
	{
		Build ();
		store.AppendValues(0.0,0.0);
		storeA.AppendValues(0.1,0.0);
		
		
		// aggiungo gli assi al grafico
		NuovoGraph.AppendAxis (new LinearAxis (0, AxisLocation.Bottom));
		NuovoGraph.AppendAxis(new LinearAxis (1, AxisLocation.Left));
		// creo il line plot per disegnare il grafico
		LinePlot plot = new
LinePlot(store,PlotColor.DarkBrown,PointShape.Diamond);
		LinePlot plotA = new LinePlot(storeA,PlotColor.Green,PointShape.Diamond);
		
		plot.Name = "plot";
		plot.SetValueDataColumn (0, 0);
		plot.SetValueDataColumn (1, 1);
		
		plotA.Name = "plot";
		plotA.SetValueDataColumn (0, 0);
		plotA.SetValueDataColumn (1, 1);
		
		// creo un plot range ovvero le bande colorate di range			
		ReferenceRangePlot Rng = new ReferenceRangePlot (118.0,150.0,
1,PlotColor.Brown);
		// aggiungo al grafico i tracciati creati
		NuovoGraph.AddPlot(plot,NuovoGraph.Axes);
		NuovoGraph.AddPlot(plotA,NuovoGraph.Axes);
		NuovoGraph.AddPlot(Rng,NuovoGraph.Axes);
		this.hbox2.Add(NuovoGraph);
		NuovoGraph.Visible=true;
		NuovoGraph.CanFocus = false;
		//creo il timer
		ourTimer = new System.Timers.Timer();
		// attacco l'evento al timer
		ourTimer.Elapsed += new ElapsedEventHandler(OnTimerElapsed);
		// imposto l'intervallo a 5 secondi
		ourTimer.Interval = 1000;
	}
	
	protected void OnDeleteEvent (object sender, DeleteEventArgs a)
	{
		Application.Quit ();
		a.RetVal = true;
	}

	protected virtual void StartT (object sender, System.EventArgs e)
	{
		if (ourTimer.Enabled == false)
		{
			ourTimer.Enabled = true ;
			button1.Label ="Started";
			}
		else
		{	
			ourTimer.Enabled = false ;
			button1.Label = "Stopped";
			}

	}
	private void OnTimerElapsed(object sender, ElapsedEventArgs e)
     {
		Console.WriteLine("-> on plot in");
		y=y + 0.2;
		store.AppendValues(y,(Math.Sin (y)+1)*75);
		LinePlot plot = new LinePlot(store,PlotColor.Green,PointShape.Diamond);
		NuovoGraph.RemovePlot(plot);
		NuovoGraph.AddPlot(plot,NuovoGraph.Axes);
		Console.WriteLine("-> on plot out");
		Console.WriteLine("-> on plotA in");
		x=x + 0.2;
		storeA.AppendValues(x+0.5,(Math.Sin (x)+1)*75);
		LinePlot plotA = new
LinePlot(store,PlotColor.DarkBrown,PointShape.Diamond);
		NuovoGraph.RemovePlot(plotA);
		NuovoGraph.AddPlot(plotA,NuovoGraph.Axes);
		Console.WriteLine("-> on plotA out");
		}


}

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