Change image/background color for Notification Tray icon area?

Uses an image defined in Title Bars and Window Frames / UIS2 Frames / Non captioned window edge / [Image] tab.  On Win10 I have the best luck with a bmp or tga without any real transparency, transparency seems to leave some graphics remnants when I mouseover the icons, but you can give it a try if you like.  It's a 2 part image, left and right, so if you want a 100x100 pixel square frame make the image 200 wide x 100 tall and duplicate the left and right halves.  Default image count is 4 but ignore it, everyone seems to just leave it there.

Background color is System Colors / Menu.  Text color is Controls / Menus / Popup menus / Menu item / [Text]tab.  As you might expect those settings will affect various other places, so it's best to keep light colors somewhat light and dark colors somewhat dark, else you will probably be chasing down other things to change.  

Please note. On Windows 10 you can remove the non caption image if you wish and change a color. To change that notification tray area color.

Edit skin color/ show me the skin defined system colors. What you want to change is "ButtonDKShadow" Always click Apply. NOTE: I have not found any other effect on the WB when changing this color. In fact it's easier to just change the color. Also you can actually make the color the same as the right click on the taskbar.

 Thanks guys, I appreciate the help!