@Override
		public Object getValueAt(int row, int col) {
			if(col == 0) 
				return ganttChart.get(row).beginningTime + "";
			else if(col == 1) 
				return ganttChart.get(row).processingID; 
			else if(col == 2) 
				return ganttChart.get(row).endingTime + ""; 
			else 
				return -1;
		}