There are a lot of users complaining about the CB8 GUI and it’s seemingly weird method of not working like other windows standard software does. If you didn’t see the posts already, enabling, or was it disabling (neither works imo) the windows “aero” theme seems to alleviate some issues but I’m not sure about the specific one you brought up. Can’t hurt to try it for yourself and see if it helps (enable if disabled or disable if enabled). Good luck. 
Right now, if you are working with one monitor you will need to get used to setting the specific CB panes you typically use in their own space on the screen. None can overlap or you will surely get the hiding windows syndrome. Know that they are at least working to return the option for the mix console “Always on top” feature.
Support that request here if you want:
BTW… it took a maintenance release (8.0.5) to get that right-click “minimize all” option put back on. And it is still messed up and I am certain Steinberg realizes it.
Regards 