Can’t see the setCaption String, or constructor caption parameter anywhere. Left and right caption works. Also setCaptionAsHtml doesn’t seem to make captions rendered as html. Vaadin 8.0.1 (and Spring Boot).
@Override
protected void init(VaadinRequest request) {
personSelect = new TwinColSelect<>("<h1>Select persons</h1>");
personSelect.setCaptionAsHtml(true);
personSelect.setRightColumnCaption("<h2>Selected Persons</h2>");
personSelect.setLeftColumnCaption("<div style=\"color:green\">Available Persons</div>");
personSelect.setDataProvider(DataProvider.fromStream(list1.stream()));
personSelect.setItemCaptionGenerator(Person::getCaption);
personSelect.select(list1.get(0), list1.get(5)); setContent(personSelect);
}This renders the left and right column caption as plain text and the main caption is nowhere to be seen.
Also it seem the left column caption is left-aligned to the left side of the listbox, while the right side caption seems to have some left padding.