How to manage the selection in ASPxGridLookup depending on one of the items selected

This example illustrates a scenario, in which one item in the GridLookup drop-down list "includes" all others. If this item is selected, all other items should be unselected. This is achieved using the client-side SelectionChanged event of the drop-down ASPxGridView.

See also:
ASPxDropDownEdit - CheckComboBox Emulation