RibbonGroup DataBinding

<ribbon:Group
  x:Class="Automon.CE_LEGAL.Modules.Dashboard.DashboardGroup"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:ribbon="http://schemas.actiprosoftware.com/winfx/xaml/ribbon"
  xmlns:inf="clr-namespace:Automon.CE_LEGAL.Infrastructure;assembly=Automon.CE_LEGAL.Infrastructure"
  xmlns:data="clr-namespace:Automon.CE_LEGAL.Entities;assembly=Automon.CE_LEGAL.Entities"
  Label="Dashboard" ItemsSource="{Binding Configuration.Categories}" >
  <ribbon:Group.ItemTemplate>
    <DataTemplate>
      <ribbon:PopupButton Label="{Binding Description}" VariantSize="Large" ImageSourceLarge="{Binding ImageSourceLarge}" ImageSourceSmall="{Binding ImageSourceSmall}" >
        <ribbon:Menu ItemsSource="{Binding Gadgets}" >
          <ribbon:Menu.ItemTemplate>
            <DataTemplate>
              <ribbon:Button Label="{Binding Description}" ImageSourceSmall="{Binding ImageSourceSmall}"
                             Command="{Binding DataContext.AddGadgetItemCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ribbon:Group}}}" CommandParameter="{Binding}" />
            </DataTemplate>
          </ribbon:Menu.ItemTemplate>
        </ribbon:Menu>
      </ribbon:PopupButton>
    </DataTemplate>
  </ribbon:Group.ItemTemplate>
</ribbon:Group>