<Grid>
	<Button Content="Add Item" Name="AddItem" />
	<Button Content=" Edit Item" Name="EditItem" />
	<DataGrid x:Name="Items"
		AutoGenerateColumns="False">
		<DataGrid.Columns>
			<DataGridTextColumn Binding="{Binding ListItem1}" Header="List Item 1" IsReadOnly="True" />
			<DataGridTextColumn Binding="{Binding ListItem2}" Header="List Item 2" IsReadOnly="True" />
		</DataGrid.Columns>
	</DataGrid>
</Grid>

private ObservableCollection<ItemClass> _items = new ObservableCollection<ItemClass>();
public ObservableCollection<ItemClass> Items
{
	get { return _items; }
	set { _items = value; }
}

private AirSealNotes _selectedItem;
public AirSealNotes SelectedItem
{
	get { return _selectedItem; }
	set
	{
		_selectedItem = value;
		NotifyOfPropertyChange(() => SelectedItem);
	}
}

public void AddItem()
{
	/* Modal Window */
	_windowManager.ShowDialog(new EditItemViewModel(_events));
}

public void EditItem()
{
	/* Modal Window */
	_windowManager.ShowDialog(new EditItemViewModel(_events, SelectedItem));
}

public void Handle(SaveItemMessage message)
{
	try
	{
		if (message.EditViewModel.NewJob)
		{
			Items.Add(new ItemClass{
				//new items added
			});
		}
		else
		{
			SelectedItem.ListItem1 = message.EditViewModel.ListItem1;
			SelectedItem.ListItem2 = message.EditViewModel.ListItem2;
		}
	}
	catch { }
}

ItemClass tempItem = SelectedItem;
Items.Remove(SelectedItem);
Items.Add(tempItem);