Основы WPF

<Window x:Class="WpfApp2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Menu, ToolBar, TabControl, ToolTip" 
    SizeToContent="WidthAndHeight"
    
    ToolTipService.InitialShowDelay="0"
    ToolTipService.ShowDuration="500000"
        >
    
    <Window.ToolTip>
        <ToolTip x:Name="toolTip" 
            Placement="RelativePoint"
            VerticalOffset="10" 
            />
    </Window.ToolTip>
    
    <DockPanel Background="LightGray">
        <Menu DockPanel.Dock="Top">
            <MenuItem Header="_File">
                <MenuItem Header="E_xit" Click="ExitClicked" />
            </MenuItem>
            <MenuItem Header="_Edit">
                <MenuItem Header="_Cut" />
                <MenuItem Header="C_opy" />
                <MenuItem Header="_Paste" />
            </MenuItem>
        </Menu>
        
        <ToolBarTray DockPanel.Dock="Top">
            <ToolBar>
                <Button Width="23">A</Button>
                <Button Width="23">B</Button>
                <Button Width="23">C</Button>
                <Button Width="23">D</Button>
            </ToolBar> 
            <ToolBar Header="Search">
                <TextBox Width="100" />
                <Button Width="23">Go</Button>
            </ToolBar>
        </ToolBarTray>
        
        <TabControl>
            <TabItem Header="Page1">
                <StackPanel>
                    <Expander Header="Секция 1" IsExpanded="True">
                        <GroupBox Header="Подсекция A">
                            <Label>Некоторый текст!</Label>
                        </GroupBox>
                    </Expander>
                </StackPanel>
            </TabItem>
            <TabItem Header="Page2">
                <StackPanel Orientation="Horizontal" Margin="5">
                    <TextBlock Name="value" Margin="10" Text="255" Width="20" />
                    <Slider Name="slider" Width="240" 
                            Minimum="0" Maximum="255" Value="255" 
                            ValueChanged="slider_ValueChanged" />
                </StackPanel>
            </TabItem>
            <TabItem Header="Page3">
                <UniformGrid Rows="3" Columns="3">
                    <Button ToolTip="Кнопка 1" Margin="5">1</Button>
                    <Button ToolTip="Кнопка 2" Margin="5">2</Button>
                    <Button ToolTip="Кнопка 3" Margin="5">3</Button>
                    <Button ToolTip="Кнопка 4" Margin="5">4</Button>
                    <Button ToolTip="Кнопка 5" Margin="5">5</Button>
                    <Button ToolTip="Кнопка 6" Margin="5">6</Button>
                    <Button ToolTip="Кнопка 7" Margin="5">7</Button>
                    <Button ToolTip="Кнопка 8" Margin="5">8</Button>
                    <Button ToolTip="Кнопка 9" Margin="5">9</Button>
                </UniformGrid>
            </TabItem>
        </TabControl>
    </DockPanel>
</Window>

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.Navigation;
using System.Windows.Shapes;
    
namespace WpfApp2
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    
        private void ExitClicked(object sender, RoutedEventArgs e)
        {
            this.Close();
        }
    
        private void slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            value.Text = ((int)slider.Value).ToString();
        }
    }
}