You can apply a drag and drop behavior on the object you want to have this effect. From there on, just set the events to do what you need it to do. If you are still having problems with it, you should be able to find lots of information on it in the manual, but the best way would be to just play around with it. It is quite straight forward so you will grasp how it work soon.
Hi,
Thanks for the reply, after looking around, my question is preatty stupid...