WorksheetItem headerItem = (WorksheetItem) getFacet(HEADER_FACET_NAME);
if (headerItem != null)
{
int colspan = getChildrenOfType(getChildren(), UIColumn.class).size();
excelWorkbook.addWorksheetHeader(headerItem, colspan);
}
// Add worksheet level items
List<WorksheetItem> items = getItems(getChildren());
for (WorksheetItem item : items)