How to actualise the display if the selected option is changed with Jquery ?

[badulesia]

Hello.
I test what the user enters in the page, and if necessary, change the selected option of a select menu using jquery. It works well with native selects and a few jquery lines.
If I use pretty dropdowns instead of native selects, the selected option is correctly set in the native select, but the pretty dropdown is not actualized. So is there a way to force the display to actualize when the selected option changed ?
The refresh method is aimed to recreate the dropdown when the options list is modified (dynamic content), so it's not the appropriate solution.
Thank you.