UTF-8 in manifest in non-Unicode build

When  I build my application exe and the XTToolkit DLL using Unicode everything works as expected.

But I'm testing different language combinations to better understand what is going on.

When I build both my application and the XTToolkit Pro using non-Unicode I have problems seeing e.g. simplified Chinese characters in my program. This is of cause expected.

Then I set the manifest file for my exe to include the line:

<activeCodePage xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>

This makes my exe using the MFC controls able to show the simplified Chinese characters correctly. However the controls used by the XTToolkit don't shot the text as UTF-8. 

See the example above, where a simple MFC dialog belonging to my exe shows the text correctly, but the XTPGrid display the same text incorrectly.

So, what is the problem?

How do I tell the XTToolkit DLL to use UTF-8?

Do I need to set the same manifest for the XTPToolkit DLL I build?

Do I need to set something like this?

XTPResourceManager()->GetLanguageInfo()->nCodePage

It seems that adding the manifest to the XTToolkit DLL does not make a difference ?

But, enabling the "Beta: Use Unicode UTF-8  for worldwide language support" regional settings feature in Windows 10/11 solves the problem in the XTToolkit controls. So the question is then, how do I enable this programmatically or through a manifest for the XTToolkit DLL controls?

Any Ideas?