How to create new column to Grid using Vaadin 8.0.7

Hello!

I have one specific problem. I need to create new column by click the button. It means → I want have about 20 new colums without properties. And when i try this → It was always a big problem. Please help me with that.

public class MyUI extends UI {
    
    private CustomerService service = CustomerService.getInstance();
    private Grid<Customer> grid = new Grid<>(Customer.class);
    private TextField filterText = new TextField();
    
    @Override
    protected void init(VaadinRequest vaadinRequest) {
      
    final VerticalLayout layout = new VerticalLayout();

        Button clearFilterTextBtn = new Button(FontAwesome.TIMES);
        clearFilterTextBtn.setDescription("Clear the current name");
        clearFilterTextBtn.addClickListener(e -> filterText.clear());
        CssLayout filtering = new CssLayout();
        filtering.addComponents(filterText, clearFilterTextBtn);
        filtering.setStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);
        Button addCustomerBtn = new Button("Pridaj zamestnanca");
        Button downloadXlsBtn = new Button("Stiahnuť ako .xls");
        Button loginBtn = new Button("Prihlásiť sa");
        Button backBtn = new Button("Vlož");
        downloadXlsBtn.setVisible(false);
        TextField name = new TextField();
        PasswordField pass = new PasswordField();
 
        addCustomerBtn.setStyleName(ValoTheme.BUTTON_PRIMARY);
        addCustomerBtn.setClickShortcut(KeyCode.ENTER);
        loginBtn.setClickShortcut(KeyCode.ENTER);

        
        
        backBtn.addClickListener(evt -> {
       
       //Here i want have adding the new columns
        grid.addColumn("Something") //It doesn't work 
       
        });
      
       HorizontalLayout toolbar = new HorizontalLayout(name, pass, loginBtn,filtering, addCustomerBtn,backBtn,downloadXlsBtn);

       grid.setColumns("datum", "lastName");
        
       HorizontalLayout main = new HorizontalLayout(grid);
       main.setSizeFull();
       grid.setSizeFull();
     
        grid.getColumn("datum").setWidth(100);
   
        grid.getColumn("datum").setCaption("Date");
        grid.getColumn("lastName").setCaption("Last Name");
        
        layout.addComponents(toolbar, main);

        updateList();
        setContent(layout);
        
 
        
        
        
    }

My error:

A Grid created without a bean type class literal or a custom property set doesn't support finding properties by name.