// invisible dockables
for( int i = 0, n = setting.getInvisibleCount(); i < n; i++ ){
DockLayoutComposition composition = setting.getInvisibleLayout( i );
if( composition != null ){
PerspectiveElement element = conversion.convert( composition );
if( element instanceof CommonElementPerspective ){
CDockablePerspective dockable = ((CommonElementPerspective)element).getElement().asDockable();
if( dockable != null ){
DockableProperty location = setting.getInvisibleLocation( i );
String root = setting.getInvisibleRoot( i );