288733 Enhance Prototype Based Widget

I need someone to enhance this UI widget: [login to view URL] to include the following features: - allow for multiple selection in the pull-down/menu (displaying as the user is typing) through check boxes, and space bar (so the user can scroll through the list + click space bar to select multiple entries. - have a button next to the text input field which when clicked displays a windows which contains a shuttle-box (two combo boxes) the first containing available items for selection, the second display what has already been selected (either through the input box, or through this control). The user can add/remove selections and click done - at which time the selected items on the main input are updated. - fix a bug, when the user clicks on a name/item on the list with the mouse, it must be added to selected items If you are unclear on this, please PMB me for a wireframe/sketch of what is being asked.