VB OLE Drag-Drop..heellpp

i am having a problem with my drag-drop in my listview..whenever i want to add files through drag-drop i am not able to add all my files..only the folder gets added and not the files inside it..i wanted only to add the files..and also if there are child folders inside the parent folder neither the child folders nor the files inside them are getting added..how do i come about this problem????