Slice/Cashier/EnabledCashierWindow.xaml

<Window x:Class="Cashier.EnabledCashierWindow"
        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:Cashier"
        mc:Ignorable="d"
        Title="Разблокировать" Height="450" Width="800" MaxWidth="800" MaxHeight="450" WindowStartupLocation="CenterScreen" MinHeight="450" MinWidth="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBlock Text="Введите код сотрудника" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="5"></TextBlock>
        <TextBox Grid.Column="1" Name="TxtNumberEmployee" VerticalAlignment="Bottom" Height="30" Margin="5,0,200,5" VerticalContentAlignment="Center" Padding="5,0,0,0"></TextBox>
        <Button Grid.Row="1" Name="BtnEnabledCashier" Click="BtnEnabledCashier_Click" Grid.ColumnSpan="2" VerticalAlignment="Top" Height="30" Margin="300,20,300,20">Разблокировать</Button>
    </Grid>
</Window>