Picture1.Picture Isnull()

Hi,
how can I detect if Picture1.Picture is null or if Picture1 contains a picture?
I tried :

1) MsgBox (Picture1.Picture = Picture1.LoadPicture("")) -> returns: method not found
2) MsgBox (IsObject(Picture1.Picture)) -> returns always true
3) MsgBox IsNull(Picture1.Picture) -> returns always false

..without success.