SparkLine ghost on resize

[Alexey Oyun]

Hi,

Problem:

  1. Assign collection to sparkline
  2. Assign null to sparkline
  3. Resize sparkline

Result:
  Sparkline will show its state before assigning null to it.

Expected:
  Sparkline should be empty.

  XAML:

Grid x:Name="LayoutRoot">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Grid x:Name="_column" SizeChanged="_column_SizeChanged">
            <Controls:RadLinearSparkline x:Name="_Spark" ShowMarkers="True" Height="100" Width="100" />
        </Grid>
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="45,12,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" Grid.Column="1" />
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="45,41,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" Grid.Column="1" />
        <sdk:GridSplitter Name="gridSplitter1" VerticalAlignment="Stretch" HorizontalAlignment="Right" VerticalContentAlignment="Stretch" />
    </Grid>

C#:

public partial class MainPage : UserControl
    {
        public class dataXY
        {
            public dataXY(double x, double y) { X = x; Y = y; }
            public double X { get; set; }
            public double Y { get; set; }
        }
        private ObservableCollection<dataXY> _data = new ObservableCollection<dataXY>();
        public MainPage()
        {
            InitializeComponent();
            _Spark.XValuePath = "X";
            _Spark.YValuePath = "Y";
            Binding bind = new Binding();
            bind.Source = _data;
            bind.Mode = BindingMode.OneWay;
            _Spark.ItemsSource = _data;
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            _data.Add(new dataXY(1, 0));
            _data.Add(new dataXY(2, 1));
            _data.Add(new dataXY(10, 2));
            _data.Add(new dataXY(11, 3));
            _data.Add(new dataXY(12, 2));
            _data.Add(new dataXY(20, 1));
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            _Spark.ItemsSource = null;
        }

        private void _column_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            _Spark.Width = _column.ActualWidth;
        }
    }

Sincerely, Alexey.

[Evgeni "Zammy" Petrov]

Hi Alexey Oyun,

 Thank you for pointing out this problem. We are working on it.
Here is a link to PITS issue: 
http://www.telerik.com/support/pits.aspx#/public/silverlight/4100

All the best,
Evgeni "Zammy" Petrov
the Telerik team