ya - 'always on top' seems to be the option for Cubase 4 anyway.. here's what i got from user Hackenslash at Cubase.net:
"Every time a window pops up and reduces the arrange window, right-click on that window (in a blank area) and click on "always on top". This is close to, but not the same as, the always on top option in your preferences. If a window is set to "always on top", it will have no effect on your project window when you open it.
Hope this helps."