// Get list data
String listId = (String)readAttribute(UiListTag.LIST_ID_KEY_REQUEST, PageContext.REQUEST_SCOPE);
// Include form tag
formTag = new UiFormTag();
this.registerSubtag(formTag);
formTag.setId(listId + "." + ListWidget.FILTER_FORM_NAME);
this.executeStartSubtag(formTag);
// Continue