Gwt 通过单击子面板中的按钮关闭弹出面板

我有以下面板层次结构：

自定义面板1包含PopupPanel包含DecklayoutPanel包含自定义面板2包含流程面板包含按钮

如何通过单击按钮关闭自定义面板1或PopupPanel？

/CustomPanel 2

class CustomPanel2 {
  @UiField Button closeButton;

  public CustomPanel2() {
    initWidget(uiBinder.createAndBindUi(this));
  }

  public HasClickHandlers closeButton() {
    return closeButton;
  }
}

//客户小组1

class CustomPanel1 implements ClickHandler {
  @UiField PopupPanel myPopupPanel;
  @UiField CustomPanel2 customPanel2;

  public CustomPanel1() {
    initWidget(uiBinder.createAndBindUi(this));
    customPanel2.closeButton().addClickHandler(this);
  }

  @Override
  public void onClick(ClickEvent e) {
    myPopupPanel.hide();
  }
}

//客户小组2

class CustomPanel2 {
  @UiField Button closeButton;

  public CustomPanel2() {
    initWidget(uiBinder.createAndBindUi(this));
  }

  public HasClickHandlers closeButton() {
    return closeButton;
  }
}

//客户小组1

class CustomPanel1 implements ClickHandler {
  @UiField PopupPanel myPopupPanel;
  @UiField CustomPanel2 customPanel2;

  public CustomPanel1() {
    initWidget(uiBinder.createAndBindUi(this));
    customPanel2.closeButton().addClickHandler(this);
  }

  @Override
  public void onClick(ClickEvent e) {
    myPopupPanel.hide();
  }
}