Debug Data Bindings Using an Empty IValueConverter

   
   

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="clr-namespace:WpfApplication1" Title="Debug Data Bindings Using an IValueConverter"  Width="200"  Height="200">
  <Window.Resources>
    <local:DummyConverter x:Key="DummyConverter" />
  </Window.Resources>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="0.5*" />
      <RowDefinition Height="0.5*"/>
    </Grid.RowDefinitions>
    <CheckBox x:Name="chkShouldItBeOpen" IsChecked="False" Content="Open" Margin="10"/>
    <Expander IsExpanded="{Binding ElementName=chkShouldItBeOpen, Path=IsChecked,Converter={StaticResource DummyConverter}}"
      Grid.Row="1" Background="Black"  Foreground="White" Margin="10" VerticalAlignment="Center" 
      HorizontalAlignment="Center" Header="Expander!">
      <TextBlock Text="Open!" Foreground="White"/>
    </Expander>
  </Grid>
</Window>

//File:Window.xaml.cs
using System.Windows;
using System;
using System.Globalization;
using System.Windows.Data;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }

    public class DummyConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }

        public object ConvertBack(object value,Type targetType,object parameter,CultureInfo culture)
        {
            return value;
        }
    }
}