title: Vaadin ComboBox always displays the previous value if select() is called
body: <p>I have a custom ComboBox, where as user types the values are loaded from a webservice. If no values are found, I want to reset the combobox to empty value. However, this does not work if the comboBox has been initialized with some preselected value. If I call comboBox.select("") or even comboBox.setValue(null) the previous preselected value is shown, even though I call removeAllItems. This sound like a comboBox bug to me, but maybe somebody knows a workaround.</p>