Working with the ribboncontrolslibrary, when I run my application the title bar looks like W98 application,. How can I make it look pretty?

Edit: It seems that has something to do with the theme used on windows.

any help would be appreciated.

alt text http://img718.imageshack.us/img718/8188/321321.jpg

<r:RibbonWindow x:Class="Produccion_Dampers.main"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:r="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
 Title="Window1"
 Height="600"
 Width="800">
    <DockPanel>
        <r:Ribbon DockPanel.Dock="Top" Title="my App looks like s***t">
        </r:Ribbon>
    </DockPanel>
</r:RibbonWindow>
c# wpf ribbon-control
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