Add custom button to jQuery UI MultiSelect Widge

Hi.I want to put a asp.net button when the dropdownlist checklist container opens.I'am using the jquery ui (dropdownlist checkhlist)  There is an example of what i want down here.Any help 

 is appreciated,thanks.

(for example there is a button on the downside of the dropdown checklist container.)

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• Topic Participants

• slayer35