MainWindow.xaml

<Window x:Class="R0409.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:R0409"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="163*"/>
            <ColumnDefinition Width="199*"/>
            <ColumnDefinition Width="155*"/>
        </Grid.ColumnDefinitions>
        <TextBlock Name="ContentTextBlock" HorizontalAlignment="Left"
                   Margin="44,10,0,0"
                   Text=""
                   VerticalAlignment="Top"
                   Width="425" Grid.ColumnSpan="3" Height="21"/>
        <Button Content="Sync" HorizontalAlignment="Left"
                Margin="44,155,0,0"
                VerticalAlignment="Top"
                Width="75"
                Click="ButtonSync_Click" Height="20"/>
        <Button Content="Async"
                HorizontalAlignment="Left"
                Margin="57,155,0,0"
                VerticalAlignment="Top"
                Width="75"
                Click="ButtonAsync_Click" Grid.Column="1" Height="20"/>
        <Button Content="Async OK"
                HorizontalAlignment="Left"
                Margin="49,155,0,0"
                VerticalAlignment="Top"
                Width="75"
                Click="ButtonAsyncOK_Click" Grid.Column="2" Height="20"/>
    </Grid>
</Window>