demoekz/Cafe/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="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="370"/>
        </Grid.RowDefinitions>
        <Button  Height="35" Width="75" HorizontalAlignment="Right" Margin="5" Name="BackBtn" Click="BackBtn_Click">Back</Button>
        <Frame Grid.Row="1" Name="MainFrame" NavigationUIVisibility="Hidden"></Frame>
    </Grid>
</Window>