New Post: Using Message.Attach in code instead of Xaml

var button = new Button { Content = "Click Me" };

var action = new ActionMessage();
action.MethodName = "ModifyList";
action.Parameters.Add(new Parameter { Value = DataContext });
action.Attach(button);

var trigger = new System.Windows.Interactivity.EventTrigger();
trigger.EventName = "Click";
trigger.SourceObject = button;
trigger.Actions.Add(action);

Interaction.GetTriggers(button).Add(trigger);