panel.refresh();
assertCells(panel.getWidgets().get(0), 0, 0, 1, 1);
assertCells(panel.getWidgets().get(1), 1, 0, 1, 1);
assertCells(panel.getWidgets().get(2), 0, 1, 1, 1);
// refresh() second time, just to covert double initialization, no changes expected
panel.refresh();
assertCells(panel.getWidgets().get(0), 0, 0, 1, 1);
assertCells(panel.getWidgets().get(1), 1, 0, 1, 1);
assertCells(panel.getWidgets().get(2), 0, 1, 1, 1);
}