Quote Originally Posted by Igor Vartanov View Post
... which means you applied that wrong way.

A choice, don't know better or worse, would be to understand the suggested solution in details. Did you? Do you understand what the code does, and what for? Do you see how new supplementary windows appear? Do you see how those windows change original z-order, subclass original controls, route scroll messages? Unless you do, all the code would seem doing a kind of magic while it's just a pure technique.
I know what you said ... The main reason that I didn't dig in to reveal why the scrollbars has disappeared in the real application is because in the test project, the scrollbars looks ugly ... but, if this is the way, I will go on this way ...