Display a Context Menu with Opacity

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<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="100" Width="300">
    <Grid>
        <TextBox FontSize="16"  Height="23" Name="txtTextBox" >
            <TextBox.ContextMenu>
                <ContextMenu HasDropShadow="True" Opacity=".8">
                    <MenuItem Command="Cut" Header="Cu_t" />
                    <MenuItem Command="Copy" Header="_Copy" />
                    <MenuItem Command="Paste" Header="_Paste" />
                    <Separator/>
                    <MenuItem Click="SelectAll_Click" Header="_Select All" />
                    <MenuItem Click="Clear_Click" Header="_Clear" />
                    <Separator/>
                    <MenuItem Header="Format">
                        <MenuItem Click="TextStyle_Click" Header="_Normal" Name="miNormal"></MenuItem>
                        <MenuItem Click="TextStyle_Click" FontWeight="Bold" Header="_Bold" Name="miBold"></MenuItem>
                        <MenuItem Click="TextStyle_Click" FontStyle="Italic" Header="_Italic" Name="miItalic"></MenuItem>
                    </MenuItem>
                </ContextMenu>
            </TextBox.ContextMenu>
            A TextBox control with ContextMenu.
        </TextBox>
    </Grid>
</Window>
//File:Window.xaml.cs
using System.Windows;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void Clear_Click(object sender, RoutedEventArgs e)
        {
            txtTextBox.Clear();
        }
        private void SelectAll_Click(object sender, RoutedEventArgs e)
        {
            txtTextBox.SelectAll();
        }
        private void TextStyle_Click(object sender, RoutedEventArgs e)
        {
            if (sender == miNormal)
            {
                txtTextBox.FontWeight = FontWeights.Normal;
                txtTextBox.FontStyle = FontStyles.Normal;
            }
            else if (sender == miBold)
            {
                txtTextBox.FontWeight = FontWeights.Bold;
            }
            else if (sender == miItalic)
            {
                txtTextBox.FontStyle = FontStyles.Italic;
            }
        }
    }
}