In the preceding example, the ListBox control contains five items as ListBoxItem. When you launch the application, by default, the second item is selected due to its property IsSelected being set to True.
The two buttons are used to add or delete items in the Listbox control. Click on the + button to trigger the OnAddItemClicked event, which will create a new instance of the ListBoxItem and add it to the ListBox control. Scroll the list to see the newly added entry. As the SelectedItem property of the ListBox is assigned with the latest item, it will now get selected, removing the previous selection.
Click on the - button to trigger the OnDeleteItemClicked event. This will get the current selected item, and, if it is not null, it will be removed from the ListBox control. The property SelectedIndex will set to 0 (zero), to select the first element after deletion.