question: public void toBack ( final WorkflowAnnotation anno ) { if ( anno == null ) { throw new IllegalArgumentException ( "anno must not be null!" ) ; } synchronized ( lock ) { if ( annotationsDrawOrder . remove ( anno ) ) { annotationsDrawOrder . add ( 0 , anno ) ; } if ( annotationsEventOrder . remove ( anno ) ) { annotationsEventOrder . add ( annotationsEventOrder . size ( ) , anno ) ; } } }
target:  Bring the given annotation to the back. That annotation will be drawn behind all other annotations as well as recieve events last.