Would like to place draggable div inside the droppable in Jquery UI Drag N Drop with revert with close button

Would like to place draggable div inside the droppable in Jquery UI Drag N Drop with revert with close button

I am developing a questionnaire, where I need to drag the answers in droppable div with close button & after closing this will goes to it's parent position. I don't want to do duplication. but when I place inside the droppable div its just change its position not showing inside that div. please help me for this.

here is similar code : http://jsfiddle.net/d9BVF/2/