private void populateFunctionComboBox(){
  if (envVarComboBox != null) {
    DefaultComboBoxModel<String> model=new DefaultComboBoxModel<String>();
    model.addElement("");
    for (    String name : envVarMap.keySet()) {
      model.addElement(name);
    }
    envVarComboBox.setModel(model);
  }
}

private void populateFunctionComboBox ( ) { if ( envVarComboBox != null ) { DefaultComboBoxModel < String > model = new DefaultComboBoxModel < String > ( ) ; model . addElement ( "" ) ; for ( String name : envVarMap . keySet ( ) ) { model . addElement ( name ) ; } envVarComboBox . setModel ( model ) ; } }
populate function combo box .
