@Override
	public LabItem getValueWith(String specificator) 
	{
		try
		{
			Iterator<LectureItem> it = workingItems.keySet().iterator();
			LectureItem current;
			while(it.hasNext())
			{
				current = it.next();
				if(current != null)
				{
					if(workingItems.get(current).getLabSession().getTitle().equals(specificator))
					{
						return workingItems.get(current);
					}
				}
			}
			return null;  
		}
		catch(Exception e)
		{
			return null;
		}
	}