PanelManagerImpl.java

  @Override
    public void setPerspective( final PerspectiveDefinition perspective ) {
        final PanelDefinition newRoot = perspective.getRoot();

        //ederign o que falta aqui, saber como ele define o root, pq o estquema aqui embaixo tá dando null;
        final WorkbenchPanelPresenter oldPresenter = mapPanelDefinitionToPresenter.remove( root );
        final SimplePanel container;
        if ( oldPresenter != null && oldPresenter.getPanelView().asWidget().getParent() != null ) {
            container = (SimplePanel) oldPresenter.getPanelView().asWidget().getParent();
        } else {
            container = null;
        }
        factory.destroy( root );

        this.root = newRoot;
        this.perspective = perspective;
        WorkbenchPanelPresenter newPresenter = getWorkbenchPanelPresenter( newRoot );
        if ( newPresenter == null ) {
            newPresenter = factory.newWorkbenchPanel( newRoot );
            Widget parent = newPresenter.getPanelView().asWidget().getParent();
            mapPanelDefinitionToPresenter.put( newRoot, newPresenter );
        }
        if ( container != null ) {
            if ( oldPresenter != null ) {
                oldPresenter.removePanel();
            }
            //colocar duas perspectivas
            if(perspective.getName().contains( "Home" )){
                //procurar aqui um modo de já pegar a activity
                PerspectiveActivity defaultPerspectiveActivity = getDefaultPerspectiveActivity();
                container.setWidget( defaultPerspectiveActivity.getRealPresenterWidget() );
            }
            else{
                container.setWidget( newPresenter.getPanelView() );
            }

        }
    }