SquareBox.xaml

<UserControl x:Class="projekt_wpf_2048.SquareBox"
             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" 
             xmlns:local="clr-namespace:projekt_wpf_2048"
             x:Name="SquareWindow"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800" Background="{Binding ElementName=SquareWindow, Path=Color}" Padding="10, 10, 10, 10" BorderThickness="2" BorderBrush="Black">
    <Grid>
        <TextBlock x:Name="SquareNumber" Text="{Binding ElementName=SquareWindow, Path=Number}" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30"></TextBlock>
    </Grid>
</UserControl>