import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.linuxtools.internal.tmf.ui.Activator;
import org.eclipse.linuxtools.internal.tmf.ui.ITmfImageConstants;
-import org.eclipse.linuxtools.tmf.core.event.ITmfTimestamp;
+import org.eclipse.linuxtools.tmf.core.timestamp.ITmfTimestamp;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.core.BaseMessage;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.core.BasicExecutionOccurrence;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.core.Frame;