MVVMにおけるCommandバインド(3)任意のイベントを容易に実現するCommand

<Window x:Class="WpfApplication1.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
		xmlns:vm="clr-namespace:WpfApplication1"
        Title="Window2" Height="124" Width="214">
	<Window.DataContext>
		<vm:Window2ViewModel />
	</Window.DataContext>
    <Grid>
		<Button Name="btn" Content="Button" Height="33" HorizontalAlignment="Left" Margin="40,24,0,0" VerticalAlignment="Top" Width="109">
			<i:Interaction.Triggers>
				<i:EventTrigger EventName="Click">
					<i:InvokeCommandAction Command="{Binding Command1}" CommandParameter="10" />
				</i:EventTrigger>
				<i:EventTrigger EventName="MouseMove">
					<i:InvokeCommandAction Command="{Binding Command2}" CommandParameter="{Binding ElementName=btn}" />
				</i:EventTrigger>
			</i:Interaction.Triggers>
		</Button>
	</Grid>
</Window>

namespace WpfApplication1 {
	public class Window2ViewModel {

		public ICommand Command1 {
			get {
				return new DelegateCommand<string>((str) => {
					MessageBox.Show("Command1 with parameter:"+str);
				});
			}
		}

		public ICommand Command2 {
			get {
				return new DelegateCommand<Button>((button) => {
					Point p = Mouse.GetPosition(button);
					button.Content = string.Format("{0},{1}", p.X, p.Y);
				});
			}
		}
	}
}