Controller

package javafxapplication1;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;

/**
 *
 * @author Guillaume
 */
public class SampleController implements Initializable {

    @FXML
    private Label lb_config , lb_select , lb_config_act , lb_vit , lb_tps , lb_imp ;

    @FXML
    private TextField tf_vit , tf_tps , tf_imp ;

    @FXML
    private Button bt_visualiser , bt_modif;

    @FXML
    private ComboBox<String> me_sel;

    @FXML
    private void buttonAction(ActionEvent event)
    {
        tf_vit.setText("Value"+me_sel.getValue());
    }
    String item1 = "1";
    String item2 = "2";
    ObservableList<String> list = FXCollections.observableArrayList(
            item1 , item2
            );



    @Override
    public void initialize(URL url, ResourceBundle rb) {
       me_sel.setItems(list);
        // TODO
    }
}