| Package | Description | 
|---|---|
| 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.cellview.client | The "cellview" widget set. | 
| com.google.gwt.user.client.ui | Widgets, Panels, and other user-interface classes. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <T> void | OpenEvent. fire(HasOpenHandlers<T> source,
    T target)Fires a open event on all registered handlers in the handler manager.If no
 such handlers exist, this method will do nothing. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | AbstractCellTreeAn abstract representation of a tree widget that renders items using
  Cells. | 
| class  | CellBrowserA "browsable" view of a tree in which only a single node per level may be
 open at one time. | 
| class  | CellTreeA view of a tree. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | DisclosurePanelA widget that consists of a header and a content panel that discloses the
 content when a user clicks on the header. | 
| class  | TreeA standard hierarchical tree widget. |