The DataSource property can change the Key property using the Key field as explained bellow:

• Key or Data Key, specifies the index or the name of the field from the Data Member that generates keys for the current view. For instance, "Key=CountryCode" specifies that the CountryCode field of the current view generates keys for next child views. The Key property of the View object can be used to access the key of the view at runtime. If the Key refers to an exiting field/column in the current view, it means that the control generates the next view, once the user selects one or more items into the current view. If the Key is empty or points to an non-existing field/column in the current view, no view will be generated once an item in the current view is selected. The control fires the CreateView event once a new view requires to be created. The ViewStartChanging(exSelectChange) / ViewEndChanging(exSelectChange) event notifies your application once the selection into the view is changing. During any event, you can access the view that generated the event, using the View property of the control. The Select property of the control generates the path of the current selection for all views using the Key property of each View ( separated by \ backslash character ). For instance, the Select property could return "US\AK". The Key field is not required, and if missing no view will be generated once the user selects an item into the current view.

The Select property can select items using wild characters such as * or ?, if the view's SingleSel property is False.