import java.util.Comparator;
-import org.eclipse.linuxtools.tmf.event.TmfTimestamp;
+import org.eclipse.linuxtools.tmf.core.event.TmfTimestamp;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.drawings.IGC;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.drawings.ISDPreferences;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.util.SortSyncMessageComparator;