This is a pseudo-dynamic system tray.
I had the problem that a system tray doesn't resize for itself, but with this theme you can resize it at the size you want sice it has a simple menu (it pops up with the third button).
You will probably have to reload the theme if you changed the size to fit an unfitted icon.
It will remember the size once you've closed the theme.
I know that autoresize will be a better solution but I don't know how to do it (if possible).
If you have any problems/suggestions, post a message here or email me.