MainWindow.xaml

<Window x:Class="WpfHostingSkeleton.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:WpfHostingSkeleton"
        mc:Ignorable="d"
        d:DataContext="{d:DesignInstance local:DesignMainWindowViewModel, IsDesignTimeCreatable=true}"
        Title="MainWindow" Height="450" Width="800" IsEnabled="{Binding Path=IsNotBusy}">
    <Grid>
        <StackPanel Orientation="Vertical">
            <TextBlock x:Name="Text"/>
            <TextBlock Text="{Binding Path=Data}"/>
            <Button Click="OnClick" HorizontalAlignment="Left">Click me!</Button>
            <Button Click="DoSomethingAsync" HorizontalAlignment="Left">Click me also!</Button>
        </StackPanel>
    </Grid>
</Window>