Layout 代码名一层布局不填充屏幕

我用这个线程实现了浮动按钮： 但我有一个布局问题。内容不想填满屏幕。以下是截图：

下面是我如何创建内容的：

final Container paneContainer = new Container(new LayeredLayout());

private Container getBottomContainer(Form parent) {
                newsfeedContainer.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
                newsfeedContainer.setScrollableY(true);
                loadData();
                newsfeedContainer.addPullToRefresh(new Runnable() {
                    public void run() {
                        loadData();
                    }
                });
                //newsfeedContainer.add(new Button("Button")).add(new Button("Button")).add(new Button("Button")).add(new Button("Button")).add(new Button("Button"));
                return newsfeedContainer;
            }

    private Container getUpperContainer(Form par) {
            FlowLayout flow = new FlowLayout(Component.RIGHT);
            flow.setValign(Component.BOTTOM);
            Container conUpper = new Container(flow);
            Button plus = new Button();
            FontImage.setMaterialIcon(plus, FontImage.MATERIAL_ADD, 5);
            plus.addActionListener((ActionEvent evt) -> {
                Form f = new PostComment().commentForm(parent);
                f.getToolbar().setBackCommand(parent.getTitle(), BACK_POLICY, e -> parent.showBack());
                f.show();
            });
            conUpper.addComponent(plus);
            conUpper.setScrollableX(false);
            conUpper.setScrollableY(false);
            return conUpper;
        }

    public Container getContainer(Form parent) {
            this.parent = parent;
            paneContainer.setScrollableY(false);
            paneContainer.addComponent(BorderLayout.center(getBottomContainer(parent)));
            paneContainer.addComponent(BorderLayout.south(getUpperContainer(parent)));
            return paneContainer;
        }

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如何使容器填满屏幕，并正确设置右下角的“加号”按钮？

制作表单边框布局并将paneContainer放置在中间

啊，你救了我一天。谢谢。仅供参考@ShaiAlmog不知道C1是否有ootb浮动按钮。感谢您的实施，我们将尝试实施它。这是我们刚刚宣布的新功能