[GNC] dark theme on Linux

[Michael]

I have the following configuration: MX Linux 19.4 AHS, GnuCash 4.5, I 
have Adwaita-dark theme enabled by default in MX, when I start GNC, the 
buttons/menu has no dark theme enabled, tried the solution suggested in 
this post <cid:part1.CD5676F6.DD59D71C at yahoo.com>, still doesn't work, 
how can I enable dark theme in GNC? Please see the attached screenshot.

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