public String getToolTipText() {
   IFile f = (IFile) EclipseResourceUtil.getResource(object);
   if (f != null && f.exists()) return f.getLocation().toString();
   return object.getPresentationString();
 }
 public String getLabelPart(XModelObject object) {
   return "" + object.getPresentationString(); // $NON-NLS-1$
 }
 public String getName() {
   return object.getPresentationString();
 }