Sometimes we used complex ways so many times, we forgot the simplest ways to do the task.

I know how to do command binding, but i always use same approach.

Create a class that implements ICommand interface and from the view model i create new instance of that class and binding works like a charm.

This is the code that i used for command binding

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;            
        testCommand = new MeCommand(processor);
    }

    ICommand testCommand;

    public ICommand test
    {
        get { return testCommand; }
    }
    public void processor()
    {
        MessageBox.Show("hello world");
    }
}

public class MeCommand : ICommand
{
    public delegate void ExecuteMethod();
    private ExecuteMethod meth;
    public MeCommand(ExecuteMethod exec)
    {
        meth = exec;
    }

    public bool CanExecute(object parameter)
    {
        return false;
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {
        meth();
    }
}

But i want to know the basic way to do this, no third party dll no new class creation. Do this simple command binding using a single class. Actual class implements from ICommand interface and do the work.