import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;


/**
 *
 * @author akouznet
 */
public class Bug extends Application {
    
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        
        final TextField textField1 = new TextField();
        
        final FlowPane root = new FlowPane();
        root.getChildren().add(textField1);
        
        root.focusedProperty().addListener(new ChangeListener<Boolean>() {

            @Override
            public void changed(ObservableValue<? extends Boolean> arg0, Boolean arg1, Boolean focused) {
                if (!focused) {
//                    Platform.runLater(new Runnable() {
//
//                        @Override
//                        public void run() {
                            root.getChildren().remove(textField1);
//                        }
//                    });
                }
            }
        });
        
        root.setFocusTraversable(true);
        
//        root.requestFocus();
        
        
        Scene scene = new Scene(root, 1000, 500);
        
        stage.setScene(scene);
        stage.show();
    }
    
}