}
private CalendarCellContent[] createContentForCells() {
final CalendarCellContent[] cellContents = new CalendarCellContent[rows * columns];
final CollectionContent content = (CollectionContent) getContent();
for (final ObjectAdapter element : content.elements()) {
final Date date = dateFor(element);
if (date == null) {
continue;
}
final int period = cellLayout.getPeriodFor(date);