Including objects binding in MultiBinding command parameter - wpf

Question

I am attempting to use a <MultiBinding> to pass two parameters to my ViewModel's command but am having issues getting the XAML parser to accept my attempts.
Consider the following ListView contained within my UserControl which is bound to a collection of Ticket objects.
<ListView x:Name="lvTicketSummaries"
ItemsSource="{Binding TicketSummaries}"
ItemContainerStyle="{DynamicResource ResourceKey=ListViewItem}"
IsSynchronizedWithCurrentItem="True">
The respective style ListViewItem
<Style x:Key="ListViewItem" TargetType="{x:Type ListViewItem}">
<Setter Property="ContextMenu" Value="{DynamicResource ResourceKey=cmListViewItem}"/>
<!-- A load of irrelevant stuff ->
</Style>
And the referenced ContextMenu item where the source of my query sits;
<!-- ContextMenu DataContext bound to UserControls view model so it can access 'Agents' ObservableCollection -->
<ContextMenu x:Key="cmListViewItem" DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}}, Path=DataContext}">
<MenuItem Header="Send as Notification" ItemsSource="{Binding Path=Agents}">
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<!-- Display the name of the agent (this works) -->
<Setter Property="Header" Value="{Binding Path=Name}"/>
<!-- Set the command to that of one on usercontrols viewmodel (this works) -->
<Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.SendTicketNotification}" />
<Setter Property="CommandParameter">
<Setter.Value>
<MultiBinding Converter="{StaticResource ResourceKey=TicketNotificationParameterConverter}">
<MultiBinding.Bindings>
<!-- This SHOULD be the Agent object I clicked on to trigger the Command. This does NOT work, results in either exception or 'UnsetValue' -->
<Binding Source="{Binding}" />
<!-- Also pass in the Ticket item that was clicked on to open the context menu, this works fine -->
<Binding RelativeSource="{RelativeSource AncestorType={x:Type ListView}}" Path="SelectedItem" />
</MultiBinding.Bindings>
</MultiBinding>
</Setter.Value>
</Setter>
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
</ContextMenu>
So here is what I am attempting to do;
The context menu has a single item "Send ticket as notification" which, when selected, lists all the available Agents which can receive said notification. This works.
When I click on one of these agent options, I want the context menu item to send both the ticket item that was clicked on from the listview to show the context menu (this works) AND the Agent item I selected from the context menu. I have half-achieved this with the MultiBinding
<MultiBinding Converter="{StaticResource ResourceKey=TicketNotificationParameterConverter}">
<MultiBinding.Bindings>
<!-- This works, it sends the Ticket object to the Converter -->
<Binding RelativeSource="{RelativeSource AncestorType={x:Type ListView}}" Path="SelectedItem" />
<!-- This caused an exception saying that I can only set 'Path' property on DependencyProperty types -->
<Binding Path="{Binding}" />
</MultiBinding.Bindings>
</MultiBinding>
Now although the actual set-up of the context menu seems some what complicated to me. The actual specification that one of the MultiBinding parameters should be the actual item bound to the clicked ContextMenu.MenuItem seems quite a simple command. The context menu correctly lists all Agents and so I would of thought that simply asking for this current object to be sent through as a command parameter, simple. I have also tried;
<Binding RelativeSource={RelativeSource AncestorType={x:Type MenuItem}} Path="SelectedItem" />
as well as
<Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}} Path="SelectedItem" />
But all that gets sent to the Parameter converter is UnsetValue
Thank you for your time and any suggestions you might have.

Answer 1

This line is odd:
<Binding Path="{Binding}" />
Is the current DataContext a string that would suffice as a path that would find something in the current DataContext which is in fact not a string after all? Makes perfect sense.
Did you mean to do this instead which binds to the DataContext?
<Binding />