CMFCRibbonBar High DPI

In my (otherwise) high DPI aware MFC application, I use a ribbon bar as the primary interface. I've provided high resolution (48x48) image strips, but when displaying on a high DPI (4k) monitor, these are not used.

I know I can trap a message when the DPI changes, and use this to rescale UI items (I do this for a few owner drawn aspects already to increase the font size), is there any way I can force CMFCRibbonBar to use the High DPI images?

Thanks,

Paul