if (OS.SendMessage (handle, OS.LVM_GETCOUNTPERPAGE, 0, 0) <= 0)  return;
public void showItem (TableItem item) {	checkWidget ();	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);	if (item.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);	int index = indexOf (item);	if (index != -1) {		OS.SendMessage (handle, OS.LVM_ENSUREVISIBLE, index, 0);	}}