Telerik controls windows phone 8.1

Question

Trying to implement a conversation view in a wp8.1 app using telerik controls, a platform im not familiar with. I keep getting a reference error on build:

Error   3   The name "RadPointerContentControl" does not exist in the namespace "clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Primitives".  D:\Visual Studio Workspace\Sports App\Sports App Prototype\Sports App Prototype\MainPage.xaml   74  29  Sports App Prototype

This error is really confusing me. I have referenced

xmlns:telerikPrimitives="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Primitives"

in the XAML document but cannot seem to get it working properly, as if its just not seeing the reference properly, or is missing it at build time, tbh i havent a clue!

Any help would be much appreciated.

EDIT: XAML

<Page xmlns:Maps="using:Windows.UI.Xaml.Controls.Maps" 
  x:Class="Sports_App_Prototype.MainPage"
  xmlns:primitives="clr-namespace:Telerik.Windows.Controls.Primitives;assem‌​bly=Telerik.Windows.Controls.Primitives" 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="using:Sports_App_Prototype"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="d"
      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

<Grid>
    <Pivot>
        <Flyout x:Name="registration" >
            <Grid Height="320">
                <TextBlock Margin="0,0,0,309">
                    Register New User or Login
                </TextBlock>
                <TextBox Margin="10,59,10,0" Text="Password">

                </TextBox>
                <TextBox Margin="10,16,10,0" Text="Username">

                </TextBox>
                <CheckBox Margin="172,99,0,0" Content="Accept">

                </CheckBox>
                <Button Content="Register/Login" Margin="10,99,0,164">

                </Button>
            </Grid>
        </Flyout>
        <PivotItem Header="map view">
            <StackPanel>
                <Maps:MapControl Height="450" Width="355" />
                <Button x:Name="FilterButton" HorizontalAlignment="Center" Click="Filter_Click" Content="Filter" Margin="126,0,126.667,0" Height="61"/>
            </StackPanel>
        </PivotItem>
        <Flyout x:Name="Filter">
            <Grid>
                <StackPanel>
                    <TextBlock>
                        Filter Users
                    </TextBlock>
                    <RichTextBlock>
                        <!-- Stuff goes here for RTB -->
                    </RichTextBlock>
                    <CheckBox>
                        Dynamically generated from user #1
                    </CheckBox>
                    <CheckBox>
                        Dynamically generated from user #2
                    </CheckBox>
                    <CheckBox>g
                        Dynamically generated from user #3
                    </CheckBox>
                    <CheckBox>
                        Dynamically generated from user #4
                    </CheckBox>

                </StackPanel>
            </Grid>
        </Flyout>
        <PivotItem Header="chat">
            <DataTemplate>
                <Grid Margin="12">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="3*"/>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>

                    <telerikPrimitives:RadPointerContentControl Background="{StaticResource PhoneAccentBrush}"
                                                         TargetPoint="-150,-300">
                        <telerikPrimitives:RadPointerContentControl.PointerTemplate>
                            <DataTemplate>
                                <Polygon Width="12"
                                         Height="24"
                                         Points="0,0 12,0 12,12 0,24"
                                         StrokeThickness="0"
                                         Fill="{StaticResource PhoneAccentBrush}"
                                         RenderTransformOrigin="0.5, 0.5">
                                    <Polygon.RenderTransform>
                                        <ScaleTransform ScaleX="-1"/>
                                    </Polygon.RenderTransform>
                                </Polygon>
                            </DataTemplate>
                        </telerikPrimitives:RadPointerContentControl.PointerTemplate>

                        <StackPanel>
                            <TextBlock Text="{Binding Path=Text}"
                                       TextWrapping="Wrap"
                                       Margin="12"/>
                            <TextBlock Text="{Binding Path=TimeStamp}"
                                       Margin="12, 0, 12, 12"
                                       HorizontalAlignment="Right"/>
                        </StackPanel>
                    </telerikPrimitives:RadPointerContentControl>
                </Grid>
            </DataTemplate>
        </PivotItem>
    </Pivot>
</Grid>

Answer 1

This is complaining that it cannot find the reference to the .DLL. Under references in Visual Studio, do you have the file called Telerik.Windows.Controls.Primitives added? If so, then please post your entire XAML file and I'll help you troubleshoot it.

BTW, make sure you are using a Silverlight WP8.1 app and not a WinRT app.