System.Windows.Controls.AutoCompleteBox.OnDropDownOpening C# (CSharp) Method

        protected virtual void OnDropDownOpening(RoutedPropertyChangingEventArgs<bool> e)
        {
#if SILVERLIGHT
            RoutedPropertyChangingEventHandler<bool> handler = DropDownOpening;
            if (handler != null)
            {
                handler(this, e);
            }
#else
            RaiseEvent(e);
#endif
        }