WPF, MVVM, Commands from buttons within a Listbox ItemTemplate? (code included)

I want to capture button clicks from within a list item row. Below I have tried to boil the problem down as much as I can.

First, here is the xaml

<Window
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 x:Class="test2.MainWindow"
 x:Name="Window"
 Title="MainWindow">

 <Grid x:Name="LayoutRoot">
  <ListView Margin="148,74,0,202" HorizontalAlignment="Left" ItemsSource="{Binding ListData}">
   <ListView.View>
    <GridView>
     <GridViewColumn Header="Item" DisplayMemberBinding="{Binding ItemName}" />
     <GridViewColumn Header="Options" Width="200" >
      <GridViewColumn.CellTemplate>
       <DataTemplate>
        <StackPanel Orientation="Horizontal">
         <Button Content="Reject" Height="20" Width="80" Margin="5,2" Command="{Binding Commands}" CommandParameter="RejectItem" />
         <Button Content="Accept" Height="20" Width="80" Margin="5,2" Command="{Binding Commands}" CommandParameter="AcceptItem"/>
        </StackPanel>
       </DataTemplate>
      </GridViewColumn.CellTemplate>
     </GridViewColumn>
    </GridView>
   </ListView.View>
  </ListView>
  <Button Content="Test button" Height="32" Margin="148,38,0,0" VerticalAlignment="Top" Command="{Binding Commands}" CommandParameter="test" HorizontalAlignment="Left" Width="126"/>
 </Grid>
</Window>

And the code behind...

using
 
 
 System.Windows;
namespace
 
 
 test2
{
 
 
publicpartialclassMainWindow : Window
{
 
 
public MainWindow()
{
 
 
this.InitializeComponent();
DataContext = 
 
newMainWindowView();
}
}
}

And here is the view model...

using System.Collections.Generic;
using System.Windows.Input;
using System.ComponentModel;
using System;
using System.Windows;
namespace test2
{
  public class DummyData
  {
    public string ItemName { get; set; }
    //loads of other properties here
  }

  class MainWindowView : ICommand
  {
    public ICommand Commands { get; set; }

    private List<DummyData> _ListData;
    public List<DummyData> ListData
    {
      get { return _ListData; }
      set { _ListData = value; }
    }

    public MainWindowView()
    {
      Commands = this;
      ListData = new List<DummyData>() 
        {
          new DummyData {ItemName = "Item one"},
          new DummyData {ItemName = "Item two"},
          new DummyData {ItemName = "Item three"},
        };
    }

    public bool CanExecute(object parameter)
    {
      return true;
    }

    public event EventHandler CanExecuteChanged
    {
      add { CommandManager.RequerySuggested += value; }
      remove { CommandManager.RequerySuggested += value; }
    }

    public void Execute(object parameter)
    {
      if (parameter != null)
      {
        switch (parameter.ToString().ToLower())
        {
          case "rejectitem":
            // How do I know which item this relates to?
            break;
          case "acceptitem":
            // How do I know which item this relates to?
            break;
          case "test":
            MessageBox.Show("yey");
            break;
        }
      }
    }

  }
}

You will also see a button. The button command triggers perfectly, but the buttons within the list item template do not. And even if they did, how do I know which item it relates to? When I click a sub-button, the listbox row itself is not selected, so I can't bind to SelectedItem..

Can some MVVM guru please explain what I'm doing wrong or missunderstanding, and possibly post some example code?

Many thanks in advance,
Pedro