import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TestEditableComboBox extends Application{

   @Override
   public void start(Stage primaryStage) throws Exception{

      ComboBox<String> comboBox = new ComboBox<String>(FXCollections.observableArrayList("item 1",
                                                                                         "item 2",
                                                                                         "editable"));
      comboBox.setMinWidth(100D);
      comboBox.setMaxWidth(100D);
      comboBox.valueProperty().addListener((observable,
                                            oldValue,
                                            newValue) -> {

         if (newValue != null){
            if ("editable".equals(newValue)){
               // JavaFX 2.2: comboBox.setEditable(true);
               Platform.runLater(() -> comboBox.setEditable(true));
            }
            else{
               // JavaFX 2.2: comboBox.setEditable(true);
               Platform.runLater(() -> {
                  comboBox.setEditable(false);
                  comboBox.getSelectionModel().select(newValue);
               });
            }
         }
      });

      VBox vBox = new VBox(new Label("Broken caret"),
                           comboBox);
      Scene scene = new Scene(vBox);
      primaryStage.setScene(scene);
      primaryStage.show();
   }

   public static void main(String[] args){

      Application.launch(args);
   }
}