filedrop target (web dynpro java ui)

Hi all, I need toimplement aFileDropTarget in awebdynproforjava(sap netweaverdeveloperstudio). There is verylittle documentationabout that.I puttheuielementin the view.Inside thecontaineris created, I tried to putimages,tables and itemlistbox with DropTargetInfo,where you candragthe external filesto upload.The value of thefilenamePatterns attribute is:*.The resource property is bound to a context attribute of the type IWDResource. I alsocreatedtheondrop event (onlysends a message). I don´tknow what to doto make it work.
Thank you.