I installed and registered v12.10 today. I took your float buttons demo and recompiled it.
I noticed that there when I changed skin to “Black Box” that the dropdown for style and glyph layout have a painting problem. Only the selected item shows in the dropdown. The other 3 items font color unfortunately does not work.
I tried this on other dark skins. TV-b, TV-c, Office2007 Black, FM appear fine.