In Delphi, when an application releases an interface that is implemented by TLayoutWebContent or one of its descendants, it automatically calls __Release. Typically, interfaced objects use the __Release method to decrement a reference count. When the reference count drops to zero, the object is automatically freed. 

TLayoutWebContent implements its own version of the interface methods _AddRef and __Release that avoid this typical behavior. This prevents the object from being freed when its reference count drops to zero. In TLayoutWebContent, __Release always returns –1. 

_AddRef 

_Release