How to use PivotViewer in Silverlight xaml? - silverlight

How to use PivotViewer in Silverlight xaml? I read http://msdn.microsoft.com/en-us/library/system.windows.controls.pivot.pivotviewer(v=vs.95).aspx and added a reference to the assembly.But I get an error
The name "PivotViewer" does not exist in the namespace "http://schemas.microsoft.com/client/2007".
This is my xaml:
<UserControl x:Class="SilverlightApplication2.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<TextBlock Text="Hello world"></TextBlock>
<PivotViewer/>
</Grid>
</UserControl>


Added a reference to the assembly System.Windows.Controls.Pivot then
<UserControl x:Class="SilverlightApplication2.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:pivot="clr-namespace:System.Windows.Controls.Pivot;assembly=System.Windows.Controls.Pivot"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<TextBlock Text="Hello world"></TextBlock>
<pivot:PivotViewer x:Name="pViewer" />
</Grid>
</UserControl>


I have a series on my blog that walks thru using the PivotViewer. That should get you started. http://tonychampion.net/blog/index.php/series/pivotviewer-basics/

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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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as i tried
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I am trying to add Context Menu to Wpf application which uses Modern Metro UI

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</Grid.ContextMenu>
</Grid>

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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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As made clear by #Hans, I was trying to add multiple content items into a Window, in the XAML designer. This is just not possible so i had to:
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:WpfViewers="clr-namespace:Microsoft.Samples.Kinect.WpfViewers;assembly=Microsoft.Samples.Kinect.WpfViewers" xmlns:Toolkit="clr-namespace:Microsoft.Kinect.Toolkit;assembly=Microsoft.Kinect.Toolkit" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="KinectSetupDev.MainWindow"
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