Clone the dropped element

Hello

Nice work!
One of the examples says "Clone items on drag", but they don't seem to be cloned. Or maybe I have a different understanding of "clone". What I want to achieve is a list on the left with types of form elements which you can drag into a second list on the right. On drag & drop the type dragged should be kept available in the left list though, as you want to be able to add another form element of the same type.
In a second step I want to change the content of the dropped element from a simple text like "Radio button list" to an actual list of radio buttons (html), but that's probably a question to ask somewhere else, or find out myself :-)

Thanks a lot!