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class MyComponent extends WebMarkupContainer {
    public void onAttach() {
        super.onAttach();
        // handle attach event
        createRepeaterItems();
        createHeaderItems();
     }
     private void createRepeaterItems() {
        ...
     }
     private void createHeaderItems() {
        ...
     }
 }

 class MyComponent extends WebMarkupContainer {
    @OnAttach
    private void createRepeaterItems() {
        ...
    }
    @OnAttach
    private void createHeaderItems() {
       ...
    } 
}