qwerty/Cafe11/admin.xaml

<Window x:Class="Cafe11.admin"
        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:Cafe11"
        mc:Ignorable="d"
        Title="admin" Height="450" Width="800">
    <Grid>
        <Button Content="Worker" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="353,87,0,0" Click="Button_Click"/>
        <Button Content="Orders" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="353,189,0,0" Click="Button_Click_1"/>
        <Button Content="Smena" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="353,297,0,0" Click="Button_Click_2"/>
        <Button Content="Nazad" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="0,10,0,0" Click="Button_Click_3"/>

    </Grid>
</Window>