See the program below.
Baseline alignment doesn't work properly for an odd combination of CheckBox and HBox.

Test case:


package checkboxbaseline;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class CheckBoxBaseline extends Application {

@Override
public void start(Stage primaryStage) {
HBox h1 = createHBox();

h1.getChildren().addAll(new Label("Label 1:"), new CheckBox("unwrapped Checkbox - Good"), makeFill(), makeButton());
HBox h2 = createHBox();
h2.getChildren().addAll(new Label("Label 2:"), createHBox(new CheckBox("Checkbox wrapped BAD"), makeFill(), makeButton()));
HBox h3 = createHBox();
h3.getChildren().addAll(new Label("Label 3:"), createHBox(new CheckBox("Checkbox wrapped Good"), makeButton()));
HBox h4 = createHBox();
h4.getChildren().addAll(new Label("Label 4:"), createHBox(new TextField("TextField wrapped Good"), makeFill(), makeButton()));

VBox v = new VBox(4);
v.setFillWidth(true);
v.getChildren().addAll(h1,h2,h3,h4, createHBox(new Label("Notice the alignment on line 2.\n"
+"Line 4 is constructed exactly the same\n"
+"except with a TextField instead of a\n"
+"CheckBox. Why does it work?\n"
+"The HBox filler (red) has something to do with it.\n"
+"If I use a Label as a filler the problem goes away.\n")));


Scene scene = new Scene(v, 300, 250);

primaryStage.setTitle("Bad BASELINE alignment: Line 2");
primaryStage.setScene(scene);
primaryStage.show();
}

private Node makeFill() {
HBox h = new HBox();
//Label h = new Label(); // using a label fixes the alignment
h.setMinHeight(3);
h.setMaxHeight(3);
h.setPrefHeight(3);
h.setMaxWidth(Double.MAX_VALUE);
HBox.setHgrow(h, Priority.SOMETIMES);
h.setStyle("-fx-border-width: 1px; -fx-border-color: red;");
return h;
}

private HBox createHBox(Node... n) {
HBox h = createHBox();
h.getChildren().addAll(n);
return h;
}

private HBox createHBox() {
HBox h = new HBox(2);
h.setStyle("-fx-border-width: 1px; -fx-border-color: green;");
h.setMaxWidth(Double.MAX_VALUE);
h.setAlignment(Pos.BASELINE_LEFT);
HBox.setHgrow(h, Priority.ALWAYS);
return h;
}

private Node makeButton() {
Button menuButton = new Button("X"); //new Button("\u25a4");
HBox.setHgrow(menuButton, Priority.NEVER);
return menuButton;
}

public static void main(String[] args) {
launch(args);
}

}