The default setting for this property is C1.Web.Mvc.Grid.KeyAction.None, which causes the browser to select the next or previous controls on the page when the TAB key is pressed. This is the recommended setting to improve page accessibility. In previous versions, the default was set to C1.Web.Mvc.Grid.KeyAction.Cycle, which caused the control to move the selection across and down he grid. This is the standard Excel behavior, but is not good for accessibility.