WPF ContextMenu Dictionary<Key, List<Value>> databinding - wpf

Question

Assume the following class definitions.
public enum ContentType { Playlist, Audio, Video, Picture }
public interface IDataProvider
{
string Name
{
get;
}
}
public class ProviderList : List<IDataProvider>
{
}
public class MainViewModel
{
public Dictionary<ContentType, ProviderList> ProvidersDictionary;
public MainViewModel()
{
if (IsInDesignMode)
{
// Code runs in Blend --> create design time data.
}
else
{
// Code runs "for real"
this.ProvidersDictionary = new Dictionary<ContentType, ProviderList>();
ProviderList providerList = new ProviderList();
providerList.Add(new DataProvider());
this.ProvidersDictionary.Add(ContentType.Audio, providerList);
providerList = new ProviderList(providerList);
providerList.Add(new DataProvider());
this.ProvidersDictionary.Add(ContentType.Video, providerList);
}
}
}
So, this ProvidersDictionary property is bound to Window context menu as follows:
<Window.ContextMenu>
<ContextMenu ItemsSource="{Binding ProvidersDictionary}">
<ContextMenu.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Value}">
<TextBlock Margin="1" Text="{Binding Key}" Height="20"/>
<HierarchicalDataTemplate.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}" />
</DataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</ContextMenu.ItemTemplate>
</ContextMenu>
</Window.ContextMenu>
The question is: how to make ICommand databinding for the DataProvider menu item click and to retrieve data type (enum type) and data provider (IDataProvider interface) within the command' Execute method.
Update
I want to have some command class to be bound to MenuItems like:
class DataProviderMenuSelectCommand : ICommand
{
#region ICommand Members
public void Execute(object parameter)
{
ContentTypeProviderPair contentProviderPair = parameter as ContentTypeProviderPair;
if (contentProviderPair != null)
{
// contentProviderPair.Type property - ContentType
// contentProviderPair.Provider property - IProvider
}
}
}
MainViewModel will expose instance of this command class as a property.

Answer 1

The problem has been solved:
<UserControl x:Class="DataProvidersView"
...
<ContextMenu.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Command" Value="{Binding Path=DataContext.DataProviderSwitchCommand,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type vw:DataProvidersView}}}" />
<Setter Property="CommandParameter">
<Setter.Value>
<MultiBinding>
<Binding Path="DataContext.Key"
RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}" />
<Binding />
</MultiBinding>
</Setter.Value>
</Setter>
</Style>
</ContextMenu.ItemContainerStyle>
</UserControl>