selectItem
Selects the #WebKitOptionMenuItem at @index in @menu.
Selecting an item changes the text shown by the combo button, but it doesn't change the value of the element. You need to explicitly activate the item with webkit_option_menu_select_item() or close the menu with webkit_option_menu_close() in which case the currently selected item will be activated.
Since
2.18
Parameters
index
the index of the item