Cafe/Cafe2/MainWindow.xaml

<Window x:Class="Cafe.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Cafe"
        mc:Ignorable="d"
        Title="Основное окно" Height="900" Width="1600" WindowStartupLocation="CenterScreen" ResizeMode="CanMinimize">
    <Grid>
        <TabControl Name="UsersTab" BorderThickness="0">
            <TabItem Name="Waiter" Header="Официант" Height="20" Width="100" Background="#FF4F5856">
                <Grid Margin="-3,-22,-3,-2">
                    <Button x:Name="AddOrder" Content="Новый заказ" HorizontalAlignment="Center" Margin="0,302,0,0" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="AddOrderClick"/>
                    <Button x:Name="OrdersList" Content="История заказов" HorizontalAlignment="Center" Margin="0,394,0,0" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="OrdersListClick"/>
                    <!--<Button x:Name="AddWaiterReport" Content="Отчет официанта" HorizontalAlignment="Center" Margin="0,486,0,0" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="AddWaiterReportClick"/>-->
                </Grid>
            </TabItem>
            <TabItem Name="Administrator" Header="Администратор" Height="20" Width="100" Background="#FF4F5856">
                <Grid Margin="-3,-22,-3,-2">
                    <Button Name="AddEmployee" Content="Зарегистрировать сотрудника" HorizontalAlignment="Center" Margin="0,218,0,0" VerticalAlignment="Top" Height="70" Width="530" Click="AddEmployeeClick" FontSize="36"/>
                    <Button Name="EmployeesList" Content="Сотрудники" HorizontalAlignment="Center" Margin="0,310,0,0" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="EmployeesListClick"/>
                    <Button Name="ExchangesList" Content="Смены" HorizontalAlignment="Center" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="ExchangesListClick" Margin="0,402,0,0"/>
                    <Button Name="AddExchange" Content="Сформировать смену" HorizontalAlignment="Center" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="AddExchangeClick" Margin="0,494,0,0"/>
                    <Button Name="AddDish" Content="Добавить блюдо" HorizontalAlignment="Center" VerticalAlignment="Top" Height="70" Width="530" FontSize="36" Click="AddDishClick" Margin="0,586,0,0"/>
                </Grid>
            </TabItem>
        </TabControl>
    </Grid>
</Window>