penrose.addAddListener(listener); 
penrose.addBindListener(listener) 
penrose.addCompareListener(listener) 
penrose.addConnectionListener(listener) 
penrose.addDeleteListener(listener) 
penrose.addModifyListener(listener) 
penrose.addSearchListener(listener)

penrose.removeAddListener(listener) 
penrose.removeBindListener(listener) 
penrose.removeCompareListener(listener) 
penrose.removeConnection(listener) 
penrose.removeConnectionListener(listener) 
penrose.removeDeleteListener(listener) 
penrose.removeModifyListener(listener) 
penrose.removeSearchListener(listener)