To respond to events, we create listener objects.
SelectionListeneris a listener implementation used to listen for selections such as button presses
componentSelected()in the case of a button, contains the code to run when the event is fired
addSelectionListener()for a button
As of version 2.0, GWT uses handlers for its event handling. GXT version 3.0 will move from using listeners to using handlers, so that it will be compatible with the GWT event handling mechanism. This compatibility will also allow GXT 3.0 to add support for ...