[ubuntu] How to select Virtualbox window in Unity?

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http://ubuntuforums.org – Ubuntu 12.04 32bit / Virtualbox 4.1.12 I'm at my wit's end with an issue I have with with multiple Virtualbox windows run fullscreen under Unity. When I click the Virtualbox icon on the Dash, the last-accessed Virtualbox window opens. That's fine if that's the VM I want to work with but not so if I want to work with another since the open VB window prevents me from clicking the Dash icon and so I can't bring up the 'window selector'. Is there a setting I've missed or some other way to let me switch to the window I want without needing to close down the last-used virtual machine? TIA, Geoff (Hardware)