RibbonEditorStyleBehavior causes memory leak

<Window 
  x:Class="RibbonEditorMemoryLeak.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="300" Width="300">
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
      <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Button Click="OpenChildWindow_Click">Open Child Window</Button>
    <Button Grid.Row="1" Click="GarbageCollect_Click">Garbage Collect</Button>
    <TextBlock Grid.Row="2" FontWeight="Bold">Watch Debug Output for messages.</TextBlock>
  </Grid>
</Window>

using System;
using System.Diagnostics;
using System.Windows;

namespace RibbonEditorMemoryLeak
{
   public partial class Window1 : Window
   {
      public Window1()
      {
         InitializeComponent();
      }

      private void OpenChildWindow_Click(object sender, RoutedEventArgs e)
      {
         Debug.WriteLine("OpenChildWindow_Click() -> Opening Child Window");
         new RibbonWindow1().Show();
      }

      private void GarbageCollect_Click(object sender, RoutedEventArgs e)
      {
         Debug.WriteLine("GarbageCollect_Click()");
         GC.Collect();
         GC.WaitForPendingFinalizers();
         GC.Collect();
      }
   }
}

<ribbon:RibbonWindow 
  x:Class="RibbonEditorMemoryLeak.RibbonWindow1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared" 
    xmlns:ribbon="http://schemas.actiprosoftware.com/winfx/xaml/ribbon" 
  xmlns:ribboneditors="http://schemas.actiprosoftware.com/winfx/xaml/ribboneditors"
  ApplicationName="RibbonWindow1" Width="620" Height="420"
  ribboneditors:RibbonEditorsStyleBehavior.ApplyRibbonCompatibleStyles="True">
    <Grid>
    <TextBlock TextWrapping="WrapWithOverflow">
        This window will not get Garbage Collected because RibbonEditorsStyleBehavior.ApplyRibbonCompatibleStyles="True"
    </TextBlock>
  </Grid>
</ribbon:RibbonWindow>

using System.Diagnostics;

namespace RibbonEditorMemoryLeak
{

   public partial class RibbonWindow1 : ActiproSoftware.Windows.Controls.Ribbon.RibbonWindow
   {
      public RibbonWindow1()
      {
         InitializeComponent();
         Debug.WriteLine("RibbonWindow1() -> constructed");
      }

      ~RibbonWindow1()
      {
         Debug.WriteLine("~RibbonWindow1() -> deconstructed");
      }
   }
}