title: How Vaadin-flow combobox works with value change listener?
body: <p>In my web application, I want to add some features like........</p>
  
  <ol>
  <li>Combobox will be enabled when I select a pre-targeted value on another multi-select combo box(Combobox will disable first). 2. I have an enum class and set this data in two different combo box. If I select one data then it will no longer available for another combo box.</li>
  </ol>
  
  <p>Any expert here or anyone who can give me some idea?</p>