Catrobat.IDE.WindowsPhone.Controls.ListPickerControl.ListPicker.ItemsSourcePropertyChangedCallback C# (CSharp) Method

        private static void ItemsSourcePropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            var instance = dependencyObject as ListPicker;
            if (instance != null)
            {
                instance.NullItemCollection = new NullItemCollection { SourceCollection = dependencyPropertyChangedEventArgs.NewValue as IList };
                instance.NullItem = instance.NullItemCollection.NullObject;

                instance.ContentControlSelectedItem.Content = instance.SelectedItem ?? instance.NullItem;
            }
        }