code: public static SARLPackageExplorerPart openInActivePerspective() {
  		try {
  			return (SARLPackageExplorerPart) JavaPlugin.getActivePage().showView(ID_PACKAGES);
  		} catch (PartInitException exception) {
  			return null;
  		}
  	}
docs: Makes the package explorer part visible in the active perspective. If there
  isn't a package explorer part registered <code>null</code> is returned.
  Otherwise the opened view part is returned.
  
  @return the opened package explorer