i am facing binding issues on RadCartesianChart LabelDefinitions .Please see the source and suggest me some ideas to rectify this problem
<?xml version="1.0" encoding="utf-8"?>
<UserControl x:Class="Dashboard.Views.Controls.GlucoseChart" Height="auto" Width="auto" acb:CommandBehavior.Event="Unloaded" acb:CommandBehavior.Command="{Binding CloseCommand}" DataContext="{Binding Path=GlucoseReadingsViewModel, Source={StaticResource Locator}}"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Dashboard"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:chart="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Chart"
xmlns:chartView="clr-namespace:Telerik.Windows.Controls.ChartView;assembly=Telerik.Windows.Controls.Chart"
xmlns:chartEngine="clr-namespace:Telerik.Charting;assembly=Telerik.Windows.Controls.Chart"
xmlns:acb="clr-namespace:AttachedCommandBehavior;assembly=AttachedCommandBehavior">
<UserControl.Resources>
<local:GlucoseActivityTypeToImageSelector x:Key="GlucoseActivityTypeToImageSelector" />
</UserControl.Resources>
<Border Margin="0" CornerRadius="5" BorderThickness="0" Background="{DynamicResource bg_chart}">
<Grid Margin="0">
<Grid.RowDefinitions>
<RowDefinition Height="{DynamicResource HeaderHeight}" />
<RowDefinition Height="*" />
<RowDefinition Height="0" />
</Grid.RowDefinitions>
<Grid Grid.Column="0" Grid.Row="0">
<Border Style="{StaticResource Border_SubHeader}" />
<TextBlock TextWrapping="Wrap" Text="Blood Glucose Chart" Style="{StaticResource TxtBlock_ChartTitle}" />
</Grid>
<Grid Grid.Column="0" Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" />
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<Grid Name="PART_ChartTitle" Grid.Column="1" Grid.Row="0" />
<Grid Name="PART_YAxisArea" Grid.Column="0" Grid.Row="1" />
<Grid Name="PART_XAxisArea" Grid.Column="1" Grid.Row="2" />
<Grid Name="PART_BottomLegendArea" Grid.Column="1" Margin="10" Grid.Row="3">
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<TextBlock Text="Legend" />
</Grid>
<StackPanel Orientation="Horizontal" Grid.Row="1">
<StackPanel Orientation="Horizontal">
<Rectangle Width="10" Margin="5" Height="10" Fill="{Binding Stroke, ElementName=LineSeries1}" />
<TextBlock Text="{Binding SeriesLabel}" />
</StackPanel>
</StackPanel>
</Grid>
<Grid Name="PART_RightLegendArea" Grid.Column="2" Grid.Row="1" />
<chart:ChartDataSource Name="ChartDataSource1" SamplingUnit="Minute" ItemsSource="{Binding Readings}" />
<chart:RadCartesianChart Name="PART_ChartArea" Grid.Row="1" Grid.Column="1">
<chart:RadCartesianChart.Resources>
<DataTemplate x:Key="BeforeMealLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/before_meal.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="AfterMealLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/after_meal.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="AfterExerciseLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/after_exercise.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="AfterMedicationLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/after_medication.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="FastingLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/fasting.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="OthersLabel">
<StackPanel Orientation="Vertical">
<Image Width="15" Height="15" Source="/Dashboard;component/Images/others.png" />
<Border Padding="2,0,2,0" Background="{Binding Stroke, ElementName=LineSeries1}">
<TextBlock HorizontalAlignment="Center" TextBlock.Foreground="#FFFFFFFF" />
</Border>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="PointTemplate">
<StackPanel Orientation="Vertical">
<Ellipse Height="8" Width="8" Fill="#FFFFFFFF" Stroke="{Binding Stroke, ElementName=LineSeries1}" />
</StackPanel>
</DataTemplate>
</chart:RadCartesianChart.Resources>
<telerik:RadCartesianChart.Behaviors>
<chartView:ChartPanAndZoomBehavior ZoomMode="Horizontal" PanMode="Horizontal" />
<chartView:ChartTrackBallBehavior ShowTrackInfo="True" ShowIntersectionPoints="True" />
</telerik:RadCartesianChart.Behaviors>
<chart:RadCartesianChart.TooltipTemplate>
<DataTemplate>
<Border Background="#FFFFFFFF" BorderBrush="#FF000000" BorderThickness="1" Padding="5" CornerRadius="3">
<StackPanel Orientation="Vertical">
<TextBlock>
<Run Text="Timestamp: " /> <Run Text="{Binding Category, StringFormat={}{0:dd-MMM-yy hh:mm tt}}" /></TextBlock>
<TextBlock>
<Run Text="Blood Glucose: " /> <Run Text="{Binding DataItem.Glucose, StringFormat={}{0:N2}}" /> <Run Text="{Binding DataItem.Unit}" /></TextBlock>
<TextBlock>
<Run Text="Activity: " /> <Run Text="{Binding DataItem.Activity}" /></TextBlock>
</StackPanel>
</Border>
</DataTemplate>
</chart:RadCartesianChart.TooltipTemplate>
<chart:RadCartesianChart.HorizontalAxis>
<chartView:DateTimeContinuousAxis LabelFormat="dd-MMM
HH:mm" LabelFitMode="MultiLine" LabelInterval="2" PlotMode="OnTicksPadded">
<chartView:DateTimeContinuousAxis.PanZoomBarStyle>
<Style TargetType="{x:Type chartView:PanZoomBar}">
<Setter Property="FrameworkElement.Height" Value="30" />
</Style>
</chartView:DateTimeContinuousAxis.PanZoomBarStyle>
</chartView:DateTimeContinuousAxis>
</chart:RadCartesianChart.HorizontalAxis>
<chart:RadCartesianChart.VerticalAxis>
<chartView:LinearAxis Minimum="{Binding YAxisMin}" Maximum="{Binding YAxisMax}" Title="{Binding YAxisLabel}" />
</chart:RadCartesianChart.VerticalAxis>
<chart:RadCartesianChart.Series>
<chartView:LineSeries Name="LineSeries1" Stroke="{StaticResource LineChartColor1}" StrokeThickness="2" ShowLabels="True" CategoryBinding="Timestamp" ValueBinding="Glucose" PointTemplate="{StaticResource PointTemplate}" ItemsSource="{Binding Readings}">
<chartView:LineSeries.LabelDefinitions>
<chartView:ChartSeriesLabelDefinition TemplateSelector="{StaticResource GlucoseActivityTypeToImageSelector}" Margin="20,0,0,0" />
<chartView:ChartSeriesLabelDefinition Margin="20,0,0,0"
>
<chartView:ChartSeriesLabelDefinition.Template>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding DataItem.Glucose}"
HorizontalAlignment="Center"
Foreground="Black" />
</StackPanel>
</DataTemplate>
</chartView:ChartSeriesLabelDefinition.Template>
</chartView:ChartSeriesLabelDefinition>
</chartView:LineSeries.LabelDefinitions>
<chartView:LineSeries.TrackBallInfoTemplate>
<DataTemplate>
<StackPanel Background="#00FFFFFF">
<TextBlock>
<Run Text="Timestamp: " /> <Run Text="{Binding DataPoint.Category, StringFormat={}{0:dd-MMM-yy hh:mm tt}}" /></TextBlock>
<TextBlock>
<Run Text="Blood Glucose: " /> <Run Text="{Binding DataPoint.Value, StringFormat={}{0:N2}}" /> <Run Text="{Binding DataPoint.DataItem.Unit}" /></TextBlock>
<TextBlock>
<Run Text="Activity: " /> <Run Text="{Binding DataPoint.DataItem.Activity}" /></TextBlock>
</StackPanel>
</DataTemplate>
</chartView:LineSeries.TrackBallInfoTemplate>
</chartView:LineSeries>
</chart:RadCartesianChart.Series>
</chart:RadCartesianChart>
</Grid>
<Grid Grid.Column="0" Grid.Row="2">
<telerik:RadChart Name="radChart" Margin="0" Background="#00FFFFFF" ItemsSource="{Binding Readings}">
<telerik:RadChart.DefaultView>
<telerik:ChartDefaultView ChartLegendPosition="Bottom">
<telerik:ChartDefaultView.ChartLegend>
<telerik:ChartLegend Name="chartLegend" Margin="0" Header="Legend" UseAutoGeneratedItems="True" BorderThickness="0" Background="#00FFFFFF" />
</telerik:ChartDefaultView.ChartLegend>
<telerik:ChartDefaultView.ChartArea>
<telerik:ChartArea LegendName="chartLegend">
<telerik:ChartArea.ZoomScrollSettingsX>
<telerik:ZoomScrollSettings ScrollMode="ScrollAndZoom" RangeStart="0" RangeEnd="1" MinZoomRange="1" PropertyChanged="ZoomScrollSettingsX_PropertyChanged" />
</telerik:ChartArea.ZoomScrollSettingsX>
<telerik:ChartArea.AxisX>
<telerik:AxisX IsDateTime="True" ShouldScaleStepOnZoom="True" StepLabelLevelCount="1" Step="1" LabelStep="1" LayoutMode="Between" AutoRange="True" LabelRotationAngle="0" DefaultLabelFormat="dd-MMM
HH:mm" />
</telerik:ChartArea.AxisX>
<telerik:ChartArea.AxisY>
<telerik:AxisY AutoRange="True" Title="{Binding YAxisLabel}" />
</telerik:ChartArea.AxisY>
</telerik:ChartArea>
</telerik:ChartDefaultView.ChartArea>
</telerik:ChartDefaultView>
</telerik:RadChart.DefaultView>
<telerik:RadChart.SamplingSettings>
<telerik:SamplingSettings SamplingThreshold="0" />
</telerik:RadChart.SamplingSettings>
<telerik:RadChart.SeriesMappings>
<telerik:SeriesMapping LegendLabel="{Binding SeriesLabel}">
<telerik:SeriesMapping.SeriesDefinition>
<telerik:LineSeriesDefinition ShowItemToolTips="True" ItemToolTipFormat="Date: #X{dd-MMM-yy hh:mm tt}
Value: #Y{###.##}" />
</telerik:SeriesMapping.SeriesDefinition>
<telerik:ItemMapping DataPointMember="XValue" FieldName="Timestamp" />
<telerik:ItemMapping DataPointMember="YValue" FieldName="Glucose" />
</telerik:SeriesMapping>
</telerik:RadChart.SeriesMappings>
</telerik:RadChart>
</Grid>
</Grid>
</Border>
</UserControl>