model.addColumn("validate-cell-sum", String.class);
model.addColumn("validate-detail-sum", String.class);
model.addColumn("validate-row-b-sum", String.class);
model.addColumn("validate-row-a-sum", String.class);
model.addColumn("validate-column-a-sum", String.class); // should always be the same as row-b-sum
model.addColumn("validate-column-b-sum", String.class);
model.addRow("R1", "r1", "C1", "c1", 1, 1, 1, 2, 4, 2, 2);
model.addRow("R1", "r1", "C1", "c2", 2, 1, 1, 2, 4, 2, 2);
model.addRow("R1", "r1", "C2", "c1", 3, 1, 1, 2, 6, 2, 2);
model.addRow("R1", "r1", "C2", "c2", 4, 1, 1, 2, 6, 2, 4);