How to add Context Menu in wpf in Modern Metro UI - wpf

I am doing one wpf app using Modern Metro UI,i want context menus on this app
as i tried
<Controls:MetroWindow x:Class="Something" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title=""
Width="326.478"
Height="5" ShowIconOnTitleBar="True" ShowTitleBar="True"
WindowStartupLocation="CenterScreen"
GlowBrush="{DynamicResource AccentColorBrush}"
mc:Ignorable="d" ResizeMode="CanMinimize" Loaded="MetroWindow_Loaded" >
<Controls:MetroWindow.Resources>
<ContextMenu x:Key="MyContextMenu">
<MenuItem Header="Send" />
</ContextMenu>
</Controls:MetroWindow.Resources>
<Grid>
</Grid>
</Controls:MetroWindow>
I am trying to add Context Menu to Wpf application which uses Modern Metro UI


A context menu should be declared within the actual element:
<Controls:MetroWindow x:Class="Something" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title=""
Width="326.478"
Height="5" ShowIconOnTitleBar="True" ShowTitleBar="True"
WindowStartupLocation="CenterScreen"
GlowBrush="{DynamicResource AccentColorBrush}"
mc:Ignorable="d" ResizeMode="CanMinimize" Loaded="MetroWindow_Loaded" >
<Grid>
<Grid.ContextMenu>
<ContextMenu>
<MenuItem Header="Send" />
</ContextMenu>
</Grid.ContextMenu>
</Grid>

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