WPF

System.Windows.Data Error: 40 : BindingExpression path error: 'CellBackground' property not found on 'object' ''Person' (HashCode=51777710)'. BindingExpression:Path=CellBackground; DataItem='Person' (HashCode=51777710); target element is 'DataGridCell' (Name=''); target property is 'Background' (type 'Brush')

<DataGrid.CellStyle>
    <Style TargetType="{x:Type DataGridCell}">
        <Setter Property="Foreground" Value="Black"/>

        <Setter Property="Background"
       Value="{Binding Path=DataContext.CellBackground, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl, AncestorLevel=1}}"/>
    </Style>
</DataGrid.CellStyle>

namespace MySample.Converters
{
  using System;
  using System.Globalization;
  using System.Windows.Data;
  using System.Windows.Media;

  /// <summary>
  /// Converter to determine whether or not a number is negative, and apply 
  /// conditional formatting if it is.
  /// </summary>
  public class StatusTextColorConverter : IValueConverter
  {
    #region IValueConverter Members
    /// <summary>
    /// Convert from the value to the colour brush.
    /// </summary>
    /// <param name="value">The value to convert.</param>
    /// <param name="targetType">The parameter is not used.</param>
    /// <param name="parameter">The parameter is not used.</param>
    /// <param name="culture">The parameter is not used.</param>
    /// <returns>The populated colour brush.</returns>
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
      var brush = new SolidColorBrush(Colors.White);

      if (value != null && value == "Locked")
      {
        brush = Colors.Yellow;
      }

      return brush;
    }

    /// <summary>
    /// Unused in this implementation.
    /// </summary>
    /// <param name="value">The parameter is not used.</param>
    /// <param name="targetType">The parameter is not used.</param>
    /// <param name="parameter">The parameter is not used.</param>
    /// <param name="culture">The parameter is not used.</param>
    /// <returns>The parameter is not used.</returns>
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
      throw new NotImplementedException();
    }

    #endregion
  }
}

<conv:StatusTextColorConverter x:Key="statusTextColorConverter"/>

<Setter Property="Background" Value="{Binding Path=PropertyContainingEditableText, Converter={StaticResource statusTextColorConverter}}}"/>

<StatusBar ...>
  <StatusBar.ItemsPanel>
	<ItemsPanelTemplate>
		...
	</ItemsPanelTemplate>
  </StatusBar.ItemsPanel>  

  ...items...

</StatusBar>

...
public string ProductName { get; set; }
...
private bool _isSelected;
public bool IsSelected
{
get
{
    return _isSelected;
}
set
{
    _isSelected = value;
    OnPropertyChanged("IsSelected");
}
}


public event PropertyChangedEventHandler PropertyChanged;

protected void OnPropertyChanged(string name)
{
    PropertyChangedEventHandler handler = PropertyChanged;

    if (handler != null)
    {
        handler(this, new PropertyChangedEventArgs(name));
    }
}

...
void CheckAllCommandExecute()
{
    foreach (Model.Product product in AllProducts)
    {
        if (product.IsSelected == false)
        {
            product.IsSelected = true;
        }
        else
            product.IsSelected = false;
    }
}
...

<ItemsControl ItemsSource="{Binding AllProducts}">
...
<CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
...
<TextBlock VerticalAlignment="Center" Grid.Column="1" Text="{Binding Path=ProductName}" />

<ButtonContent="Select/Deselect All" Command="{Binding Path=CheckAllCommand}" />