Hi Rene, > Could you send me a working example? I do not see a problem. > How did you create a TGPicture (by derivation?). The constructor is protected. Try: TGPicture *pic=gClient->GetPicture("AnyPictureYouWant"); cout << pic->IsA()->DynamicCast(TGWidget::Class(), pic) << endl; results in: Warning in <TClass::TClass>: no dictionary for class TRefCnt is available 0x876f67c BTW: This illustrates both problems I have: - the warning - the result isn't NULL Best regards, Thomas. > > I have some problem. I'm doing a > > obj->IsA()->DynamicCast(TGWidget::class(), obj) > > If this object is a TGPicture I get a result instead of NULL. > > In my opinion doing a dynamic cast from TGPicture to TGWidget should > > result in NULL rather than an object, because it isn't derived from > > TGWidget, which can easily be tested by a > > obj->IsA()->InheritsFrom(TGWidget::class()) > > Is this behaviour intended? If so, why? > > > > This happens with root 3.02/06 and can easily be reproduced in the > > interpreter.
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