I just notice what popup window is that on the screenshot, it's a limitation, the OS paints the
Menu (classic) color behind the push buttons on that kind of window, not the button face, the
only workaround is to match the Menu and Button face classic colors (that's how the OS is b y default).
About the issue that where fixed that I told above, it existed and was really fixed but where apparent
in push button on top of tab panels and some other places, this screensoht bellow show how the
now fixed buttons show on tab panels (not the tab panel is lighter than the button face color but the
button paints without issues) and also show how the "workaround" will look.