@Override
 public boolean validatePage() {
   if (super.validatePage()) {
     VariableSelectionPaneModel variableModel = getAssistantModel().getVariableSelectionModel();
     for (int i = 0; i < variableModel.getSize(); i++) {
       final Variable variable = variableModel.getElementAt(i);
       if (variable.isSelected()) {
         return true;
       }
     }
   }
   return false;
 }
 @Override
 public AssistantPage getNextPage() {
   removeModeListener();
   final TimeSeriesAssistantModel model = getAssistantModel();
   final VariableSelectionPaneModel variableModel = model.getVariableSelectionModel();
   for (int i = 0; i < variableModel.getSize(); i++) {
     final Variable variable = variableModel.getElementAt(i);
     if (variable.isSelected()) {
       model.setTimeSeriesName("TimeSeries_" + variable.getName());
       break;
     }
   }
   return new TimeSeriesAssistantPage_TimeSeriesName(model);
 }