Defining another level of menu items within a MenuItem ItemTemplate

Defining another level of menu items within a MenuItem ItemTemplate

I have a list of objects on my WPF window, all having a context menu which
allows the user to copy or move items into different panels (so the
ItemsSource of the Context menu is this list of panels, and "Copy" and
"Move" are sub-menuitems). However, I have a "CanCopy" property defined in
the object that determines whether or not the object can actually be
copied. How can I show/hide this MenuItem depending on the value of this
property? My problem seems to be in defining this variable additional
level of MenuItems.
At first I tried something like this, but obviously it's not quite what
I'm looking for, since this doubles up the PanelName MenuItem in to two
MenuItem containers:
<MenuItem Header="Panels..." ItemsSource="{Binding PanelsList}">
<MenuItem.ItemTemplate>
<DataTemplate>
<MenuItem Header="{Binding PanelName}">
<MenuItem Header="Copy" Visibility="{Binding
CanCopy,Converter={StaticResource
BoolToHiddenConverter}}"/>
<MenuItem Header="Move"/>
</MenuItem>
</DataTemplate>
</MenuItem.ItemTemplate>
</MenuItem>
Suggestions?