Are there any way to set Checkboxes and Submit button into Dropdown?

User could select multiple items clicking Checkboxes in Dropdown and when finished selecting then accept them by pressing a Push Button inside the Dropdown. Selected items would then appear into closed Dropdown.

Is there this kind of functionality in any jQuery UI's Dropdowns or are there any other Plugin that could implement this? I tried to discover how to implement it but didn't succeeded.

Picture below should clarify what I mean.

Best Regards,

Micke