Tetris/Views/GameWindow.xaml

<Window x:Class="Tetris.Views.GameWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        mc:Ignorable="d"
        Title="GameWindow" Width="{Binding Width}" Height="{Binding Height}" KeyDown="UIElement_OnKeyDown">
    <Grid Background="Black">
        <Image Source="{Binding Source}" />
    </Grid>
</Window>