Combobox doesn't apply visibleRows for the second (and the rest) popup. First time - popup has width of row with max length, and has visibleRows at height. Problem 1 - length of row is too large, popup will be much wider than screen! I expect to have width same as combobox width. Second time (and the rest tries) - popup has the same width as combobox, and no limit to height - height allow to show all rows of combobox. Problem 2 - visibleRows not applied. I expect to show popup with height of visibleRows. I found the problem in method EPComboBox.prototype.adjustSize - this.eBox object has width/height for the first popup, and doesn't have width/height for others. But I don't know the reason of that and don't understand what to do with that. Source code is import echopointng.ComboBox; import java.util.ArrayList; import java.util.List; import nextapp.echo2.app.Column; import nextapp.echo2.app.list.DefaultListModel; import org.apache.commons.lang.RandomStringUtils; public class TextComboBox extends Column { public void init() { super.init(); ComboBox comboBox = new ComboBox(); int capacity = 50; List<String> strings = new ArrayList<String>(capacity); for (int i = 0; i < capacity; i++) { strings.add(RandomStringUtils.randomAscii(i * 10)); } comboBox.setListModel(new DefaultListModel(strings.toArray())); comboBox.setListRowCount(10); comboBox.setAutoRecall(false); add(comboBox); } }