(a)
[Category("Property Changed")]
[Description("Fired when title is changed.")]
public event EventHandler TitleChanged;

(b) 
protected virtual void OnTitleChanged(EventArgs e)
{
  if (TitleChanged != null) TitleChanged(this, e);
}

(c)
public string Title
{
   get {...}
   set 
   { 
     if (_title != value)
     {	
       _title = value; 
       OnTitleChanged(EventArgs.Empty);
     }
   }
}

Example 4: Changing notifications.