private void layoutParts() {
    getChildren().addAll(toolbarControlLeftBox, toolbarControlRightBox);
    HBox.setHgrow(toolbarControlLeftBox, Priority.ALWAYS);
  }
Creates an empty {@link ToolbarControl} object and fully initializes it.
workbenchfx-core/src/main/java/com/dlsc/workbenchfx/view/controls/ToolbarControl.java