Adding Events to TCollectionItem with C++ Builder 5

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My question is simple :

How to implement an event handling within a TCollection or TCollectionItem ?

When I simply add a TNotifyEvent to a TCollection Item, no compile error...

But at design time... a bad declaration error occurs...

I have tried on TCollection also to add a TNotifyEvent property... the same error occurs...

Looking at the header of the visual unit I just can't find any bad declaration (and the new event handler is correctly declared), as well as in the source code of the visual unit...

But when I tried to compile, as told before : declaration error !

Of course I have already added events properties on the TComponent parent object of that TCollection, and no error at compile time occurs...

Only if I introduce events in TCollection or TCollectionItem !!!

Any Idea ?

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