windowless control inside VBFocusRT6

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VB6

I have a project that will basically get info inside the focused control, and using hook, I already done with widowed control. Then I encountered windowless control, which I know cannot be access via Windows API since it has now HWND. But some link says that to access this control, you must access the container of this control. So I use VB6 mswless.ocx as my example, I create a form with windowed and windowless controls and use SPY++/Window Detective to monitor the activities of the application. I also create a small hook application that will handle keyboard focus. Upon testing, the hook get a VBFocusRT6 class when keyboard is focused on the windowless control. So I use SPY++/Window Detective if there is any Window Message on this class during focus, and it has. I also confirmed that this class (VBFocusRT6) is a container for windowless control of VB6 application according to this site

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Now my question is how do we get the info inside focused windowless control inside the container, for this example, VBFocuRT6, using Delphi code?