Yeah, I haven’t found an acceptable way to minimize (and then restore) Cubase Pro 8 on Windows (7).
Clicking on its main icon (collection of windows) in the task bar doesn’t work like with single-window applications, where you can easily toggle between showing and hiding the app.
There is no minimize in the title bar.
Right-click minimize puts it into the corner of the screen, but still leaves some VSTs visible (Like SPAN). Then once you give the background focus it does disappear, but then leaves redraw bugs on the screen that won’t go away; the playhead line.
Then when you restore by clicking on the icon in the taskbar it comes back not not all of it. 
Then, it’s a game of “find the hidden window” by trying to see which window didn’t restore and needs to be clicked on in the taskbar icon preview thing.
If Minimize All is chosen – yay! all the windows go away and no redraw bugs – but now all bets are off, there’re chores waiting when you return: opening each of your Cubase windows, one by one.
Pretty maddening.