void OnSelection (object sender, SelectedItemChangedEventArgs e)
		{
			if (e.SelectedItem == null) {
				return; //ItemSelected is called on deselection, which results in SelectedItem being set to null
			}

			Sections s = (Sections)e.SelectedItem;

			switch (s.SectionName) {
			case "Geometric Brownian Motion":
				SimulatingAndAnalyzingAssetPrices.RandomWalk rw = new SimulatingAndAnalyzingAssetPrices.RandomWalk (10.0);
				Navigation.PushAsync (new BrownianMotionChartPage (rw.BrownianSeq, rw.BrownianSeq1, rw.BrownianSeq2));
				break;
			case "MSFT Actual vs. GBM":
				var item = e.SelectedItem;
				Navigation.PushAsync (new CompareMsftHistoricalVolDriftChartPage ());
				break;
			case "Msft vs. Improved GBM":
				//			this is not properly implemented. needs non optimized drift/vol  
				//			SimulatingAndAnalyzingAssetPrices.RandomWalk rw = new SimulatingAndAnalyzingAssetPrices.RandomWalk (10.0);
							Navigation.PushAsync (new CompareMsftGbmChartPage ());
				break;
			}
			;

			((ListView)sender).SelectedItem = null; 
		}
        void OnSelection(object sender, SelectedItemChangedEventArgs e)
        {
            if (e.SelectedItem == null)
            {
                return;                 //ItemSelected is called on deselection, which results in SelectedItem being set to null
            }

            Sections s = (Sections)e.SelectedItem;

            switch (s.SectionName)
            {
            case "Geometric Brownian Motion":
                SimulatingAndAnalyzingAssetPrices.RandomWalk rw = new SimulatingAndAnalyzingAssetPrices.RandomWalk(10.0);
                Navigation.PushAsync(new BrownianMotionChartPage(rw.BrownianSeq, rw.BrownianSeq1, rw.BrownianSeq2));
                break;

            case "MSFT Actual vs. GBM":
                var item = e.SelectedItem;
                Navigation.PushAsync(new CompareMsftHistoricalVolDriftChartPage());
                break;

            case "Msft vs. Improved GBM":
                //			this is not properly implemented. needs non optimized drift/vol
                //			SimulatingAndAnalyzingAssetPrices.RandomWalk rw = new SimulatingAndAnalyzingAssetPrices.RandomWalk (10.0);
                Navigation.PushAsync(new CompareMsftGbmChartPage());
                break;
            }
            ;

            ((ListView)sender).SelectedItem = null;
        }