protected void setUp() throws Exception {
Visualization v = new Visualization();
m_items = v.addTable("items", TableTest.getTestCaseTable());
m_agg = v.addAggregates("aggregates", VisualItem.SCHEMA);
m_agg.addRow();
m_agg.addRow();
Iterator iter = m_items.tuples();
for ( int i=0, count=m_items.getRowCount(); iter.hasNext(); ++i ) {