--------------------- Code behind --------------------------
   // Using and namespace here .......
   public partial class LED1 : UserControl
    {
        public Brush Txbl1Background
        {
            get { return (Brush)GetValue(Txbl1BackgroundProperty); }
            set { SetValue(Txbl1BackgroundProperty, value); }
        }
        public static readonly DependencyProperty Txbl1BackgroundProperty =
            DependencyProperty.Register("Txbl1Background", typeof(Brush), typeof(LED1), new PropertyMetadata());

        public Brush Txbl2Background
        {
            get { return (Brush)GetValue(Txbl2BackgroundProperty); }
            set { SetValue(Txbl2BackgroundProperty, value); }
        }
        public static readonly DependencyProperty Txbl2BackgroundProperty =
            DependencyProperty.Register("Txbl2Background", typeof(Brush), typeof(LED1), new PropertyMetadata());

        public string Text1
        {
            get { return (string)GetValue(Text1Property); }
            set { SetValue(Text1Property, value); }
        }
        public static readonly DependencyProperty Text1Property =
            DependencyProperty.Register("Text1", typeof(string), typeof(LED1), new PropertyMetadata("Text1"));

        public string Text2
        {
            get { return (string)GetValue(Text2Property); }
            set { SetValue(Text2Property, value); }
        }
        public static readonly DependencyProperty Text2Property =
            DependencyProperty.Register("Text2", typeof(string), typeof(LED1), new PropertyMetadata("Text2"));


        public LED1()
        {
            InitializeComponent();
        }
    }
    --------------------------------------------------------

    ------------------------------ XAML ---------------------
    <!-- Xaml UserControl Namespace...... />
        <StackPanel>
            <TextBlock Background="{Binding Txbl1Background, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" Text="{Binding Text1, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" />
            <TextBlock Background="{Binding Txbl2Background, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" Text="{Binding Text2, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" />
        </StackPanel>
    <!-- Other thing..... />
    ---------------------------------------------------------

    ------------------------ Use ----------------------------
    <!-- Caution: namespace will depend on where you put the usercontrol
    <local:LED1 Text1="Hello XAML!" Text2="{Binding SomeBinding}" Txbl1Background="Red" Txbl2Background={Binding SomeColorBind}/>

     or (Set trực tiếp)
     myLED1.Txbl1Background = new SolidColorBrush(Color.Red);

     or (Binding)
     Binding bd = new Binding();
     bd.Path = new PropertyPath("SomeColorBind");
     BindingOperations.SetBinding(myLED1, Txbl2BackgroundProperty, bd);
    ----------------------------------------------------------