{

/// <summary>

/// INotifyPropertyChanged is necessary because we are using TwoWay binding

/// to ButtonEnabled to pass default value true to CheckBox. If Source doesn't

/// implement INotifyPropertyChange, TwoWay binding will not work.

/// </summary>

private sealed class DataContext : INotifyPropertyChanged {

public DataContext() {

command = new RelayCommand(

parameter => MessageBox.Show("Information", "Command executed !", result => { }),

parameter => ButtonEnabled );

}

private bool buttonEnabled = true;

public bool ButtonEnabled {

get { return buttonEnabled; }

set {

if ( buttonEnabled != value ) {

buttonEnabled = value;

command.RaiseCanExecuteChanged( );

}

}

}

private readonly RelayCommand command;

public ICommand MyCommand {

get {

return command;

}

}

public event PropertyChangedEventHandler PropertyChanged;

}

public static void Main(string[] args) {

DataContext dataContext = new DataContext();

WindowsHost windowsHost = (WindowsHost)ConsoleApplication.LoadFromXaml(

"Examples.Commands.windows-host.xml", dataContext);

Window mainWindow = (Window)ConsoleApplication.LoadFromXaml(

"Examples.Commands.main.xml", dataContext);

windowsHost.Show(mainWindow);

ConsoleApplication.Instance.Run(windowsHost);

}