$(document).ready(function(){
  
  $('.custom_dropdown').combobox(
   {
     comboboxContainerClass: "comboboxContainer",
     comboboxValueContainerClass: "comboboxValueContainer",
     comboboxValueContentClass: "comboboxValueContent",
     comboboxDropDownClass: "comboboxDropDownContainer",
     comboboxDropDownButtonClass: "comboboxDropDownButton",
     comboboxDropDownItemClass: "comboboxItem",
     comboboxDropDownItemHoverClass: "comboboxItemHover",
     animationType: "fade",
     width: "233px"
   });
  
})