My popup always covered other windows

Hello, Everyone I got into a problem these  dasy, my popup always covered other windows ,it's like this

I want to let my popup like a normal window and not aways covered other windows

I have read ComponentPopupBuilder.class many times , I really did't find way to deal it

Here is my code

private void customerPopupDialog(){
    JBPopupFactory instance = JBPopupFactory.getInstance();
    JButton button = new JButton("Hello Idea Plugin");
    JPanel panel = new JPanel();
    panel.setSize(40,20);
    panel.add(button);
    button.addActionListener(e -> new MyDialog(Application.project,"Test").show());
    instance.createComponentPopupBuilder(panel, new JBLabel())
            .setTitle("Customer Popup Dialog")
            .setMovable(true)
            .setResizable(true)
            .setMayBeParent(true)
            .setDimensionServiceKey(null,"com.yatoufang.test",true)
            .setNormalWindowLevel(true)
            .setMinSize(new Dimension(600,300))
            .createPopup()
            .showInFocusCenter();
}

Does anyone know how to solve it