How to use the ContextMenu classes?

I have a set of classes for working with menus that are quite like SoapBox's MenuItem classes. I don't have a context menu yet but I stumbled upon the SoapBox implementation and it seems ok, but cannot get it to work. I also found no sample of how to use it. Here's what I tried:

First I added all related classes to my project, and removed the Export attribute from ContextmenuView and ContextMenuWrapperView.

Then provide a working implementation for IContextMenu:

//code
class ContextMenuViewModel : SoapBox.Core.IContextMenu
{
//provides the ContextMenu and ContextMenuEnabled implementation
}

I changed the ContextMenuWrapperView.xaml to have a style key:

...
<Style x:Key="ContextMenuWrapperStyle" TargetType="{x:Type local:ContextMenuWrapper}">
...

And put a ContextMenu in the xaml for a usercontrol on which I want a ContextMenu shown.

...
xmlns:mnu="clr-namespace:SaopBox.Core;assembly=MyAssembly"
...
<UserControl.Resources>
  <ResourceDictionary Source="/MyAssembly;component/ContextMenuWrapperView.xaml" />
</UserControl.Resources>
<UserControl.ContextMenu>
  <ContextMenu>
    <mnu:ContextMenuWrapper Style="{StaticResource ContextMenuWrapperStyle} "DataContext="{Binding Path=MyContextMenu}"/>
  </ContextMenu>
</UserControl.ContextMenu>

The DataContext of the usercontrol is set to a VM that has the context menu VM as a property:

class UserControlViewModel
{
  ContextMenuViewModel MyContextMenu{ get; }
}

The menu is populated with a couple of items, but when running this I can see a ContextMenuWrapper being instantiated, followed by a call to MyContextMenu, and ContextMenuWrapperView/ContextMenuView are instantiated as well, but the only thing shown upon right-clik is a menu with one empty item.

Any input would be greatly appreciated!