Обновление данных в ListView

using System.Collections.ObjectModel;
using System.Windows;
using Ecng.Xaml;

namespace GuiAsyncTest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public class aaaClass
{
public decimal lastPrice;
public decimal bestAskPrice;
}

public ObservableCollection<aaaClass> aaa = new ObservableCollection<aaaClass>();


public MainWindow()
{
InitializeComponent();
}

private void TestClick(object sender, RoutedEventArgs e)
{
var curBond = new aaaClass
{
lastPrice = 100m,
bestAskPrice = 95m,
};

//aaa.Add(curBond);
//this.GuiAsync(() => aaaGrid.Items.Refresh());

this.GuiAsync(() => aaa.Add(curBond));
}
}
}

<Window x:Class="GuiAsyncTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:GuiAsyncTest"
mc:Ignorable="d"

DataContext="{Binding RelativeSource={RelativeSource Self}}"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Name="btnTest" Content="Test" Margin="5" Width="75" Click="TestClick" Height="25"/>

<ListView Grid.Row="1" ItemsSource="{Binding aaa}" Name="aaaGrid" Margin="5,5,5,5">
<ListView.View>
<GridView>
<GridViewColumn Width="120" Header="BestAsk" DisplayMemberBinding="{Binding bestAskPrice}"/>
<GridViewColumn Width="150" Header="Последняя цена закрытия" DisplayMemberBinding="{Binding lastPrice}"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>