public String getDatumValue(String datumName) {
		String fieldName = datumName;
		String value = null;
		 for (int i=0; i<displayData.size(); i++ ) {
			 
			 TileObjectDisplayDatum dataLine = displayData.get(i);
			 
			 String label = dataLine.getName();
			 if(label.equals(fieldName)) 
			 {		 
				 value = dataLine.getValue();
			 }
		 }
		 return value;
	}