Commands in MVVM

<Window x:Class="CommandingSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:CommandingSample"
        xmlns:apexCommands="clr-namespace:Apex.Commands;assembly=Apex"
        xmlns:apexControls="clr-namespace:Apex.Controls;assembly=Apex"
        xmlns:apexConverters="clr-namespace:Apex.Converters;assembly=Apex"
        Title="MainWindow" Height="350" Width="525">
    
    <Window.Resources>
        <apexConverters:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
    </Window.Resources>
    
    <Window.DataContext>
        <local:MainViewModel x:Name="viewModel" />
    </Window.DataContext>
    
    <apexControls:ApexGrid Columns="*,*">
        
        <!-- Left hand column, the messages. -->
        <apexControls:ApexGrid Grid.Column="0" Margin="4" Rows="Auto,*">

            <TextBlock Grid.Row="0" Text="Output" FontSize="24" />
            <ScrollViewer Grid.Row="1">
                <ItemsControl ItemsSource="{Binding Messages}">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding}" TextWrapping="Wrap" />
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </ScrollViewer>
            
        </apexControls:ApexGrid>

        <!-- Right hand column, the commands. -->
        <apexControls:ApexGrid Grid.Column="1" Margin="4" Rows="Auto,*">

            <TextBlock Grid.Row="0" Text="Command Examples" FontSize="24"  />

            <ScrollViewer Grid.Row="1" >
                
                <StackPanel Orientation="Vertical">
                
                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="A simple command example." />
                        <Button Width="160" Content="Simple Command" Command="{Binding SimpleCommand}" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="A lamba command example." />
                        <Button Width="160" Content="Lambda Command" Command="{Binding LambdaCommand}" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="A parameterised command example." />
                        <Button Width="160" Content="Parameterised Command" Command="{Binding ParameterisedCommand}" CommandParameter="Apples" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="Enabling and disabling a command example." />
                        <CheckBox IsChecked="{Binding EnableDisableCommand.CanExecute, Mode=TwoWay}" Content="Enabled" />
                        <Button Width="160" Content="Enable/Disable Command" Command="{Binding EnableDisableCommand}" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="A command with events." />
                        <Button Width="160" Content="Events Command" Command="{Binding EventsCommand}" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="An asynchronous command." />
                        <Button Width="160" Content="Asynchronous Command" Command="{Binding AsyncCommand1}" />
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="Another asynchronous command." />
                        <Button Width="160" Content="Asynchronous Command" Command="{Binding AsyncCommand2}" 
                                Visibility="{Binding AsyncCommand2.IsExecuting, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}" />
                        <StackPanel Visibility="{Binding AsyncCommand2.IsExecuting, Converter={StaticResource BooleanToVisibilityConverter}}">
                            <TextBlock Margin="4" Text="The command is running!" />
                            <ProgressBar Margin="4" Height="20" Width="120" IsIndeterminate="True" />
                        </StackPanel>
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="Cancellable Asynchronous Command." />
                        <Button Width="160" Content="Cancellable Async Command" Command="{Binding CancellableAsyncCommand}" 
                                Visibility="{Binding CancellableAsyncCommand.IsExecuting, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}" />
                        <StackPanel Visibility="{Binding CancellableAsyncCommand.IsExecuting, Converter={StaticResource BooleanToVisibilityConverter}}">
                            <TextBlock Margin="4" Text="The command is running!" />
                            <ProgressBar Margin="4" Height="20" Width="120" IsIndeterminate="True" />
                            <Button Margin="4" Width="100" Content="Cancel" Command="{Binding CancellableAsyncCommand.CancelCommand}" />
                        </StackPanel>
                    </StackPanel>

                    <StackPanel Margin="10">
                        <TextBlock TextWrapping="Wrap" Text="Binding a command to an event example." />
                        <Border Margin="20" Background="Red">
                            <apexCommands:EventBindings.EventBindings>
                                <apexCommands:EventBindingCollection>
                                    <apexCommands:EventBinding EventName="MouseLeftButtonDown" Command="{Binding EventBindingCommand}" />
                                </apexCommands:EventBindingCollection>
                            </apexCommands:EventBindings.EventBindings>
                            <TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" Text="Left Click on Me" FontSize="16" Foreground="White" />
                        </Border>
                    </StackPanel>
                </StackPanel>
            </ScrollViewer>

        </apexControls:ApexGrid>

    </apexControls:ApexGrid>
</Window>