Java 代号一个应用程序 UI 容器在程序更新后未呈现

我在代码名为One的应用程序中无法使UI正常工作.我将其提炼为加载ParentContainer的"starter应用程序".

ParentContainer有一个按钮，用于更新子容器.它实际上只是在您单击按钮时删除和添加标签.

THE PROBLEM: The ChildContainer doesn't seem to want to render the label? Its empty. If I force a hard refresh in the Simulator by ROTATING THE DEVICE then it renders the label one time. I also checked the Codename One desktop application build and see the same problem. For the Desktop Build I can resize the main window and it will render the label.

没有任何程序可以让它显示出来.invalidate()/repaint()/callSerially()

即使在我将其显示出来之后，如果我再次按下ParentContainer按钮，它也会消失.我做错了什么？任何帮助都将不胜感激.

public class BugTestApp extends Lifecycle {

    @Override
    public void runApp() {
        Form hi = new Form("Hi World");
        hi.setLayout(new BorderLayout());

        ParentContainer container = new ParentContainer();
        container.init();

        hi.add(BorderLayout.CENTER, container);
        hi.show();
    }
}

public class ParentContainer extends Container {
    ChildContainer childContainer=null;
    
    public void init() {
        
        this.setLayout(new BorderLayout());
        Button btnFilterCategory = new Button("CLICK ME TO ACTIVATE");
        btnFilterCategory.addActionListener(e-> {
            childContainer.reloadAll();
        });
        this.add(BorderLayout.NORTH,btnFilterCategory);

        childContainer = new ChildContainer();
        childContainer.initComponents();
        this.add(BorderLayout.CENTER, childContainer);
    }
}

public class ChildContainer extends Container {

    public void initComponents() {
        setLayout(new BoxLayout(BoxLayout.Y_AXIS));
        reloadAll();
    }

    public void reloadAll() {
        this.removeAll();
        this.add(new Label("This is a label."));
        this.repaint();
    }
}