Useful C# XAML

Get Tree View item on context menu action.cs

// Note, may have to use System.Windows.Controls

// In your method.

private void someTreeCm_SomeCommand(object sender, RoutedEventArgs e)
{
  CustomTreeItem item = ((sender as MenuItem).DataContext) as CustomTreeItem;
}

// In your XAML

  <TreeView x:Name="someTree">

      <TreeView.ItemTemplate>
          <HierarchicalDataTemplate ItemsSource="{Binding Items}">
              <StackPanel Orientation="Horizontal">
                  <Label Content="{Binding Name}" />
                  <StackPanel.ContextMenu>
                      <ContextMenu>
                          <MenuItem Header="SomeCommand" Click="someTreeCm_SomeCommand" />
                      </ContextMenu>
                  </StackPanel.ContextMenu>
              </StackPanel>
          </HierarchicalDataTemplate>
      </TreeView.ItemTemplate>

  </TreeView>