if (element instanceof CompositeDataPropertySource) {
int idx = cell.getColumnIndex();
CompositeDataPropertySource cdps = (CompositeDataPropertySource) element;
IPropertyDescriptor[] propertyDescriptors = cdps.getPropertyDescriptors();
if (propertyDescriptors != null && propertyDescriptors.length > idx && idx >= 0) {
IPropertyDescriptor descriptor = propertyDescriptors[idx];
if (descriptor != null) {
Object value = cdps.getPropertyValue(descriptor.getId());
if (value instanceof Long) {
Long l = (Long) value;
long timestamp = l.longValue();
if (timestamp <= 0) {
return null;