Dragging into an Iframe won't work

I have a tree and am trying to create a “trash bin” area, where users can drag and drop items no longer needed and would like to do this using an empty frame. The sample says this should work:

new dhtmlDragAndDropObject();

but it doesnt’ (even their sample doesn’t work).

Any ideas? Has anyone gotten this to work?

a) be sure to use dhtmlx 2.6 ( 2.5 has regression in cross frame dnd )
b)
new dhtmlDragAndDropObject();

will only allow dnd dragging other frame , if you want to drop items there - you still need to place some dnd capable component in the frame

c) iframes are a bit more reliable than frames ( less problems with correct cross frame dnd )