title: WPF Ribbon obscures the titlebar
body: <p>I am making a WPF program in C# in Visual Studio 2013 and I am using the Ribbon component.  So far I've only written XAML for the Ribbon and a few buttons on it, and have only modified the C# file by adding <code>using System.Windows.Controls.Ribbon;</code> and subclassing <code>RibbonWindow</code> instead of <code>Window</code>.  I remembered to add a reference to the required .dll in Visual Studio for the Ribbon.</p>
  
  <p>When I run the program, the titlebar is really covered up:
  <img src="https://i.stack.imgur.com/17fzd.png" alt="enter image description here"></p>
  
  <p>Setting the Ribbon to have <code>HorizontalAlignment="Left"</code> makes it look like this:<img src="https://i.stack.imgur.com/IGi9i.png" alt="enter image description here"></p>
  
  <p>I'm pretty new to WPF, C# and Visual Studio, so I don't have any idea what's wrong here.  I have pasted my XAML code below (omitting the tab groups and application menu):</p>
  
  <pre><code>&lt;RibbonWindow
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:Custom="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon" x:Class="SwaagPaiNT.MainWindow"
          Title="Swaag PaiNT" Height="350" Width="525"&gt;
      &lt;Grid&gt;
          &lt;Custom:Ribbon HorizontalAlignment="Stretch" VerticalAlignment="Top"&gt;
              &lt;Custom:Ribbon.HelpPaneContent&gt;
                  &lt;Custom:RibbonButton Name="what" ToolTip="whachunee" /&gt;
              &lt;/Custom:Ribbon.HelpPaneContent&gt;
  
              &lt;Custom:Ribbon.QuickAccessToolBar&gt;
                  &lt;Custom:RibbonQuickAccessToolBar&gt;
                      &lt;Custom:RibbonButton x:Name="SAVE" ToolTip="BLAZE IT"/&gt;
                      &lt;Custom:RibbonSplitButton x:Name="Undo"&gt;
                          &lt;Custom:RibbonSplitMenuItem Header="CANNOT UNDO MORE" /&gt;
                      &lt;/Custom:RibbonSplitButton&gt;
                  &lt;/Custom:RibbonQuickAccessToolBar&gt;
              &lt;/Custom:Ribbon.QuickAccessToolBar&gt;
  
          &lt;/Custom:Ribbon&gt;
  
      &lt;/Grid&gt;
  &lt;/RibbonWindow&gt;
  </code></pre>
  
  <p>This is a Windows 7 Professional 32-bit system.  </p>