firePropertyChange(MODEL_CHANGED_PROPERTY, oldModel, this.selectionModel);
firePropertyChange("model", oldModel, selectionModel);
  public void setSelectionModel(SingleSelectionModel model)  {    selectionModel = model;    if (selectionModel != model)      {	SingleSelectionModel oldModel = selectionModel;	selectionModel = model;	firePropertyChange(MODEL_CHANGED_PROPERTY, oldModel,	                   this.selectionModel);      }  }