Popup with Dropdown

Popup with Dropdown

Dear sir,
 
        I WORK ON POPUP AND DROP DOWN SO MY QUERY IS

       I USE SELECT IN POPUP AND AFTER CLICK ON SELECT THAT IS NOT POP UP 

      I USE DATA-NATIVE-MENU=FALSE BUT STILL MY DROP DOWN EFFECT NOT WORK IT WORK LIKE       SIMPLE DROP DOWN

      PLEASE GIVE ME SUGGEST ABOUT IT