/** @see javax.swing.table.TableModel#getValueAt(int, int) */
 public Object getValueAt(int arg0, int arg1) {
   switch (arg1) {
     case 0: // enabled column
       ArtefactInfo ai = (ArtefactInfo) this.fArtefactData.get(arg0);
       if (ai.getFlag(ArtefactInfo.ENABLED)) {
         return Boolean.TRUE;
       } else {
         return Boolean.FALSE;
       }
     case 1: // query name column
       return (ArtefactInfo) this.fArtefactData.get(arg0);
   }
   return null;
 }
 /**
  * @see
  *     com.ixora.rms.ui.artefacts.ArtefactSelectorPanel#showPlotMenuItemForArtefact(com.ixora.rms.client.model.ArtefactInfo)
  */
 protected boolean showPlotMenuItemForArtefact(ArtefactInfo ai) {
   // show the plot menu no matter what is the state of the artefact
   return ai.isCommitted();
 }