## Uses of Interface
com.google.gwt.event.logical.shared.HasBeforeSelectionHandlers

Packages that use HasBeforeSelectionHandlers
com.google.gwt.event.logical.shared: Types related to logical events that do not have direct analogues to DOM events and which can be used in contexts other than web browsers.
com.google.gwt.user.client.ui: Widgets, Panels, and other user-interface classes.

### Uses of HasBeforeSelectionHandlers in com.google.gwt.event.logical.shared

Methods in com.google.gwt.event.logical.shared with parameters of type HasBeforeSelectionHandlers
`static <T> BeforeSelectionEvent<T>` BeforeSelectionEvent.`fire(HasBeforeSelectionHandlers<T> source, T item)` Fires a before selection event on all registered handlers in the handler manager.

### Uses of HasBeforeSelectionHandlers in com.google.gwt.user.client.ui

Classes in com.google.gwt.user.client.ui that implement HasBeforeSelectionHandlers
`class` `DecoratedTabBar` A `TabBar` that wraps each tab in a 2x3 grid (six box), which allows users to add rounded corners.
`class` `DecoratedTabPanel` A `TabPanel` that uses a `DecoratedTabBar` with rounded corners.
`class` `StackLayoutPanel` A panel that stacks its children vertically, displaying only one at a time, with a header for each child which the user can click to display.
`class` `TabBar` A horizontal bar of folder-style tabs, most commonly used as part of a `TabPanel`.
`class` `TabLayoutPanel` A panel that represents a tabbed set of pages, each of which contains another widget.
`class` `TabPanel` A panel that represents a tabbed set of pages, each of which contains another widget.