public int Show(boolean fShow) {
   return COM.VtblCall(7, address, fShow);
 }
 public int Drop(long /*int*/ pDataObject, POINT ppt, int dwEffect) {
   return COM.VtblCall(6, address, pDataObject, ppt, dwEffect);
 }
 public int DragLeave() {
   return COM.VtblCall(4, address);
 }
 public int DragOver(POINT ppt, int dwEffect) {
   return COM.VtblCall(5, address, ppt, dwEffect);
 }
 public int DragEnter(long /*int*/ hwndTarget, long /*int*/ pDataObject, POINT ppt, int dwEffect) {
   return COM.VtblCall(3, address, hwndTarget, pDataObject, ppt, dwEffect);
 }