[tonyweb]

Originally Posted by BlackWhite

If I create a class say MyClass which inherits CWin, and assume
that ~MyClass() will be automatically called when the MyClass object is deleted,

This is a good assumption given that you inherited "correctly" (see later).

Originally Posted by BlackWhite

then I can decide whether to transfer control to ~CWin() in
~MyClass().

As deepzero wrote, both ~MyClass() and ~CWin() will be called because of the hierarchy you established between the two classes.

Originally Posted by BlackWhite

But the weird situation is that ~CWin() is called instead of
~MyClass() when the MyClass object is deleted.

And, maybe, here's what you're missing (if I understood you correctly)! The destructor of the base class MUST BE virtual if you're destroying the object of the derived class through a pointer of the base class type.

cfr. http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors

Hope this helps a bit

Regards,
Tony