How to trigger change event for Chosen (jQuery)

Before I click reset button I choose "Company" in Chosen (dropdown list). The event occurs normally after I click reset. I choose "Company" again but event change in dropdownlist doesn't occur.

Could anyone tell me how to trigger the change event for dropdownlist after clicking reset button and then the same element?

The code I have so far:

$("#mainMenu").change(function(e){
    e.preventDefault();
    loadFirstManu(true);
});

Code for the reset button:

$("#btn_reset").click(function() {
  CKEDITOR.instances.ckeditor.setData('');
  $('.mchosen').each(function() {
     $(this).val('').trigger('liszt:updated');
     $('#submenu').attr('disabled', 'disabled').html('');
     $('#secondsubmenu').attr('disabled', 'disabled').html('');
     $('#s-menu').removeClass('required').html('');
     $('#secondsubmenu').removeClass('validate[required]');
     $('#tabmenu').attr('disabled', 'disabled').html('');
     $('#tab').removeClass('required').html('');
  });

});