/// <summary>
 /// Sets the background binding.
 /// </summary>
 /// <param name="d">The cell definition.</param>
 /// <param name="panel">The panel.</param>
 protected virtual void SetBackgroundBinding(CellDefinition d, Panel panel)
 {
     if (d.BackgroundBindingPath != null)
     {
         var binding = new Binding(d.BackgroundBindingPath) { Source = d.BackgroundBindingSource };
         panel.SetBinding(Panel.BackgroundProperty, binding);
     }
 }