private static IDisplayConverter getMillionsDisplayConverter() {
		return new DisplayConverter(){
			NumberFormat numberFormatter = new DecimalFormat("###,###,###");
                        int price = 300;

			public Object canonicalToDisplayValue(Object canonicalValue) {
				if (canonicalValue == null) {
					return null;
				}
				return numberFormatter.format(Integer.valueOf(canonicalValue.toString())*price);
			}

			public Object displayToCanonicalValue(Object displayValue) {
				return (numberFormatter.parse(displayValue.toString(), new ParsePosition(0))).intValue();
			}
		};
	}

class CalulatingEditConfiguration extends AbstractRegistryConfiguration  {

	public void configureRegistry(IConfigRegistry configRegistry) {
		
		configRegistry.registerConfigAttribute(
				EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.NEVER_EDITABLE, 
				DisplayMode.EDIT, CalculatingGridExample.COLUMN_FOUR_LABEL);
		configRegistry.registerConfigAttribute(
				EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.NEVER_EDITABLE, 
				DisplayMode.EDIT, CalculatingGridExample.COLUMN_FIVE_LABEL);
		//configure the summary row to be not editable
		configRegistry.registerConfigAttribute(
				EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.NEVER_EDITABLE, 
				DisplayMode.EDIT, SummaryRowLayer.DEFAULT_SUMMARY_ROW_CONFIG_LABEL);
		configRegistry.registerConfigAttribute(
				EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.ALWAYS_EDITABLE);

		configRegistry.registerConfigAttribute(
				CellConfigAttributes.DISPLAY_CONVERTER, new PriceConverter(), DisplayMode.NORMAL);
		configRegistry.registerConfigAttribute(
				CellConfigAttributes.DISPLAY_CONVERTER, new DefaultIntegerDisplayConverter(), DisplayMode.EDIT);
		
		configRegistry.registerConfigAttribute(
				CellConfigAttributes.DISPLAY_CONVERTER, new PercentageDisplayConverter(), 
				DisplayMode.NORMAL, CalculatingGridExample.COLUMN_FIVE_LABEL);

		configRegistry.registerConfigAttribute(
				CellConfigAttributes.DISPLAY_CONVERTER, new PercentageDisplayConverter(), 
				DisplayMode.NORMAL, SummaryRowLayer.DEFAULT_SUMMARY_COLUMN_CONFIG_LABEL_PREFIX + 4);
	}
	
	class PriceConverter extends DisplayConverter {

		public Object canonicalToDisplayValue(Object canonicalValue) {
			try {
				if (isNotNull(canonicalValue)) {
					int num = Integer.valueOf(canonicalValue.toString());
					num = num*300;					
					return num;
				}
				return null;
			} catch (Exception e) {
				return canonicalValue;
			}
		}

		public Object displayToCanonicalValue(Object displayValue) {
			try {
				if (isNotNull(displayValue) && isNotEmpty(displayValue.toString())) {
					return Integer.valueOf(displayValue.toString())/300;
				}
				return null;
			} catch (Exception e) {
				throw new ConversionFailedException(
						Messages.getString("NumericDisplayConverter.failure", //$NON-NLS-1$
								new Object[] {displayValue}), e);
			}
		}
	}
}