Custom Element Binding Window

   
  

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:src="clr-namespace:MyNameSpace.CustomElementBinding" 
        Title="Custom Element Binding Demo">
    <StackPanel>
        <ScrollBar Orientation="Horizontal"
                   Margin="24" 
                   Maximum="100"
                   LargeChange="10"
                   SmallChange="1"  
                   Value="{Binding ElementName=simple, Path=Number,Mode=OneWayToSource}" />

    <src:SimpleElement x:Name="simple" HorizontalAlignment="Center" />
    </StackPanel>
</Window>
//File:Window.xaml.cs
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Media;

namespace MyNameSpace.CustomElementBinding
{
    class SimpleElement : FrameworkElement
    {
        public static DependencyProperty NumberProperty;
        static SimpleElement()
        {
            NumberProperty = DependencyProperty.Register("Number", typeof(double),typeof(SimpleElement),
                    new FrameworkPropertyMetadata(0.0,FrameworkPropertyMetadataOptions.AffectsRender));
        }
        public double Number
        {
            set { SetValue(NumberProperty, value); }
            get { return (double)GetValue(NumberProperty); }
        }
        protected override Size MeasureOverride(Size sizeAvailable)
        {
            return new Size(200, 250);
        }
        protected override void OnRender(DrawingContext dc)    
        {
            dc.DrawText(new FormattedText(Number.ToString(), 
                        CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
                        new Typeface("Times New Roman"), 12, 
                        SystemColors.WindowTextBrush), 
                new Point(0, 0)); 
        }
    }
}