cs3.setExpression("row[\"Amount\"]");
cs3.setDataType("integer");
PropertyHandle computedSet = dataSetHandle.getPropertyHandle("computedColumns");
computedSet.addItem(cs1);
computedSet.addItem(cs2);
computedSet.addItem(cs3);
reportDesignHandle.getDataSets().add(dataSetHandle);
TableHandle mytable = elementFactory.newTableItem(null, 3, 1, 1, 1);