ChartArea.Annotations not available?

[Erik]

I have the following in my .xaml and it looks like I have everything I need in place, but I'm receiving an error saying "The attachable property 'Annotations' was not found in type 'ChartArea'?
I'm using the following version of dlls - 2010.1.309.103
Can anyone see anything wrong or maybe it's just this version of dlls I'm using??

<UserControl x:Class="lineChartRetry.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:telerikChart="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Charting"
    xmlns:chart="clr-namespace:Telerik.Windows.Controls.Charting;assembly=Telerik.Windows.Controls.Charting"
    xmlns:themingToolkit="clr-namespace:System.Windows.Controls.Theming;assembly=System.Windows.Controls.Theming.Toolkit"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
    <Grid x:Name="LayoutRoot">
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Border Style="{StaticResource NumericBorder}">
            <TextBlock x:Name="txtChartValue" TextAlignment="Center" Foreground="#FAAC58" FontSize="14" FontWeight="Bold" FontFamily="Helvetica, sans-serif"></TextBlock>
        </Border>
        <telerikChart:RadChart x:Name="RadChart1" Grid.Row="1" Grid.Column="0">
            <telerikChart:RadChart.DefaultView>
                <chart:ChartDefaultView>
                    <chart:ChartDefaultView.ChartArea>
                       <chart:ChartArea>

                          <chart:ChartArea.Annotations>
                              <chart:CustomGridLine YIntercept="150" Visibility="Visible" Stroke="Red" StrokeThickness="3" ElementStyle="{StaticResource SolidStyle}"/>
                          </chart:ChartArea.Annotations>
                       </chart:ChartArea>
                    </chart:ChartDefaultView.ChartArea>
                </chart:ChartDefaultView>
            </telerikChart:RadChart.DefaultView>
        </telerikChart:RadChart>
    </Grid>
</UserControl>

[Missing User]

Hi Erik,

Our records indicate, that you have opened a support ticket on the same issue. To avoid duplicate posts, we can continue our communication in the support ticket in question.

Kind regards,

Polina

the Telerik team