public void dropActionChanged( java.awt.dnd.DropTargetDragEvent evt ) 
                {   log( out, "FileDrop: dropActionChanged event." );
                    // Is this an acceptable drag event?
                    if( isDragOk( out, evt ) )
                    {   //evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
                        evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY );
                        log( out, "FileDrop: event accepted." );
                    }   // end if: drag ok
                    else 
                    {   evt.rejectDrag();
                        log( out, "FileDrop: event rejected." );
                    }   // end else: drag not ok
                }