code: void collectVertices(final List<ManagementVertex> vertices) {
  
  		final Iterator<ManagementVertex> it = this.groupMembers.iterator();
  		while (it.hasNext()) {
  			vertices.add(it.next());
  		}
  	}
docs: Adds all management vertices which are included in this group vertex to the given list.
  
  @param vertices
  the list to which the vertices shall be added