The component that previously had focus. This can be null the first time a component on a page receives focus, as there is no component that previously had focus.
AdfUIComponent - Returns the next component that will obtain the focus, or null if no component on the page is receiving focus. If the focus is moving around within the same component, then getPreviousComponent can return the same component as getNextComponent.
AdfUIComponent - Returns the component that previously had focus, or null if no component previously had focus. If the focus is moving around within the same component, then getPreviousComponent can return the same component as getNextComponent.