FNC Custom Control in C++ Builder

I use Rio C++ Builder, not Delphi. I love your concept of the FNC custom controls, but there is no demo project in C++ Builder that I can find.  Is there any demo project available in C++ or could you create one for either the "Developing your first FNC custom control" blog or your "TMS FNC UI Pack Video series part 2 : Components" video?

Sorry, we do not have a demo for a custom FNC control written in C++. We have focused on component creation from Delphi so far and the Delphi components can be used with C++.

This is the first such request we receive to create custom controls in C++. We'll need to allocate time to work out such example in C++.
As a starting point, the Delphi example is here:
http://www.tmssoftware.biz/download/manuals/DevelopingUIcontrolsfor3frameworks.pdf
so, 'translating' the concept to C++ is what we expect is needed to be able to do this in C++