The CollectionView has a currentItem property that identifies the item that is currently active.
This property is used by all Wijmo controls that support binding to lists and selection (including the FlexGrid, FlexChart, ListBox, ComboBox, etc).
The example below implements a simple master/detail screen. When users select a country from the ComboBox, the current item changes. This raises the currentChanged event which is used to update the elements that show the current item's details.