title: Auto select comboBox item
body: <p>I use a <code>comboBox</code> with <code>autocompletemode.append</code> and <code>autocompletesource.listitem</code>properties.</p>
  
  <p>But when I have the <code>comboBox</code> in <code>dropDown</code> mode and try to type one of elements from list and then try to commit (push <kbd>Enter</kbd> or <kbd>Tab</kbd> key) the value that is <code>selected == null</code>.
  When I type one of the value from list without "open" dropdownlist of combobox everything is ok.</p>
  
  <p>Any ideas how to solve it?</p>