<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="200" Width="300"> <DockPanel LastChildFill="True"> <Menu DockPanel.Dock="Top"> <MenuItem Header="_Edit"> <MenuItem Header="Cu_t" Command="ApplicationCommands.Cut" /> <MenuItem Header="_Copy" Command="ApplicationCommands.Copy" /> <MenuItem Header="_Paste" Command="ApplicationCommands.Paste"/> <Separator/> <MenuItem Click="SelectAll_Click" Header="_Select All" /> <MenuItem Click="Clear_Click" Header="_Clear" /> </MenuItem> <MenuItem Header="_Format"> <MenuItem Click="TextStyle_Click" Header="_Normal" Name="miNormal" /> <MenuItem Click="TextStyle_Click" FontWeight="Bold" Header="_Bold" Name="miBold" /> <MenuItem Click="TextStyle_Click" FontStyle="Italic" Header="_Italic" Name="miItalic" /> </MenuItem> </Menu> <TextBox Name="txtTextBox" TextWrapping="Wrap"> text </TextBox> </DockPanel> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Linq; 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.Navigation; using System.Windows.Shapes; 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; } } } }