Points not plotting correctly

Dec 13, 2013 at 3:26 PM
I have been going through the previous posts trying to find issues same as mine. I have implemented many things to try and get this working but it still isn't doing what i want it to...

I am creating a WP8 app and am hoping to use the chart function to display a line graph... very simple. The data for the graph is pulled from a REST service and fills a class as required. When debugging the application, i can see that the data is being loaded into the series, but it isn't plotting the data on the chart. My code is as below.
 public class ProductsGraphData
        public double Value { get; set; }
        public string Date { get; set; }

        public ProductsGraphData()

                //Code for getting REST data removed

XDocument doc = XDocument.Parse(resultString.ToString());

                var products = from p in doc.Descendants(XName.Get("ProductPriceInformation", "http://schemas.datacontract.org/2004/07/REST_Service"))
                               select new ProductsGraphData
                                   Value = double.Parse(p.Element(XName.Get("Value", "http://schemas.datacontract.org/2004/07/REST_Service")).Value),
                                   Date = DateTime.Parse(p.Element(XName.Get("Date", "http://schemas.datacontract.org/2004/07/REST_Service")).Value).ToString("dd/MM/yyyy")

                Collection = new ObservableCollection<ProductsGraphData>();

                foreach (var p in products)
                    ProductsGraphData pgd = new ProductsGraphData();
                    pgd.Date = p.Date;
                    pgd.Value = p.Value;

                chart1.Series = series(Collection);
 private SeriesCollection series(ObservableCollection<ProductsGraphData> data)
            SeriesCollection retval = new SeriesCollection();

            LineSeries line = new LineSeries();
            line.XPath = "Date";
            line.YPath = "Value";
            line.PointsSource = data;

            return retval;
Any help with this would be much appreciated.
Dec 13, 2013 at 3:33 PM
further to this, i do get a {System.Windows.LayoutCycleException: Layout cycle detected. Layout could not complete.} error after the page finishes loading. The XAML for this app is
<sparrow:SparrowChart x:Name="chart1">
                    <sparrow:CategoryXAxis Header="Date" StringFormat="dd-MM-yyyy" />
                    <sparrow:LinearYAxis MinValue="1.00" MaxValue="3.00" Header="Value" StringFormat="£0.00"/>
Dec 14, 2013 at 10:20 AM
Ok, so i have figured out what the issue is. When the Category XAxis value has more than 4 characters, it throws the error. If i set my 'Date' StringFormat to "dd" it works fine. when i do "dd-MM" or "dd-MM-yyyy" it throws the layout cycle error.

Is there any workaround in place for this, or can an update/workaround be created?