<Window x:Class="MenuItemCommands.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MenuItem Commands and Events Sample" Height="300" Width="300"> <StackPanel> <Menu> <MenuItem Header="_Edit"> <MenuItem Command="ApplicationCommands.Copy"/> <MenuItem Command="ApplicationCommands.Cut"/> <MenuItem Command="ApplicationCommands.Paste"/> </MenuItem> <MenuItem Header="_Font"> <MenuItem Header="_Bold" IsCheckable="True" Checked="Bold_Checked" Unchecked="Bold_Unchecked"/> <MenuItem Header="_Italic" IsCheckable="True" Checked="Italic_Checked" Unchecked="Italic_Unchecked"/> <Separator/> <MenuItem Header="I_ncrease Font Size" Click="IncreaseFont_Click"/> <MenuItem Header="_Decrease Font Size" Click="DecreaseFont_Click"/> </MenuItem> </Menu> <TextBox Name="textBox1" TextWrapping="Wrap" Margin="2"> this is a test </TextBox> </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace MenuItemCommands { public partial class Window1 : System.Windows.Window { public Window1() { InitializeComponent(); } private void Bold_Checked(object sender, RoutedEventArgs e) { textBox1.FontWeight = FontWeights.Bold; } private void Bold_Unchecked(object sender, RoutedEventArgs e) { textBox1.FontWeight = FontWeights.Normal; } private void Italic_Checked(object sender, RoutedEventArgs e) { textBox1.FontStyle = FontStyles.Italic; } private void Italic_Unchecked(object sender, RoutedEventArgs e) { textBox1.FontStyle = FontStyles.Normal; } private void IncreaseFont_Click(object sender, RoutedEventArgs e) { textBox1.FontSize += 2; } private void DecreaseFont_Click(object sender, RoutedEventArgs e) { textBox1.FontSize -= 2; } } }