title: Display popup when there are unsved inputs on dropdown change in JSF
body: <p>How to display of popup when any of the two dropdowns selection changed and input values are modified using JSF. I am using valuechangelistener.
  I have added a flag in my Mbean, if any of the input changes, this flag will be true. on change of the value of the dropdown, if this flag is true I need to show popup, but this is not coming</p>