Eu não consigo obter esse menu pop-up do botão direito para funcionar.

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" />
<Style TargetType="{x:Type TreeViewItem}" >
    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu  DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeView}}, Path=DataContext}">
                <MenuItem Header="Delete" Command="{Binding Path=CommandPopupClick}" CommandParameter="{Binding Path=SelectedItem}"/>
                <Separator />
                <MenuItem Header="Properties" Command="{Binding Path=CommandPopupClick}" CommandParameter="{Binding Path=SelectedItem}"/>
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

//Delegated command
public DelegateCommand CommandPopupClick { get; set; } 

//Assigning the delegate command.
CommandPopupClick = new DelegateCommand(PopupClick, CanMyCommand);

//Event for rightclick option clicked
public void PopupClick(Object Parameters)
{
    var something = Parameters; //Break is here to see if the event fires
}

Eu posso ver o menu pop-up com os itens 'Excluir' e 'Propriedades'. No entanto, quando clico em um deles, ele não dispara o evento.

NOTA: o sistema de comando delegado funciona para todo o resto, acho que não é esse o problema.

Eu realmente não quero usarName.Click += new RoutedEvent() se eu puder ajudar.

Obrigado.

Erros na depuração conforme solicitado

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'Microsoft.GeneratedCode'. 
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemCore\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemCore.dll'. Cannot find or open the PDB file.
A first chance exception of type 'System.IO.IOException' occurre,d in PresentationFramework.dll
A first chance exception of type 'System.IO.IOException' occurred in PresentationCore.dll
'Enterprise.exe' (CLR v4.0.30319: Enterprise.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll'. Cannot find or open the PDB file.
The thread 0x1954 has exited with code 259 (0x103).

Resolução:

    <Setter Property="ContextMenu">
        <Setter.Value>
            <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
                <MenuItem Header="Delete" 
                          Command="{Binding CommandPopupClick}" 
                          CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource  AncestorType=ContextMenu}}" 
                          CommandTarget="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}" />
            </ContextMenu>
        </Setter.Value>
    </Setter>
</Style>

<TreeView Name="NavigationPanel" ItemsSource="{Binding NavigationList}" Tag="{Binding Path=DataContext, ElementName=Main}"/>

Obrigado por todos que ajudaram.