How to prevent unity dash from taking keyboard control

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http://askubuntu.com – Issue Summary: When using virtualbox (VB) in fullscreen mode, VB takes control of the screen. This means that even though the Linux host desktop is locked I still am able to function in the guest OS without having to log into the linux host (when the screnesave lock comes on). The problem I have been faced with over the past few months is that whenever I lock the VB guest (it's windows, so I'm using Alt-L to lock it) it activiates the Unity Dashboard in the background. What happens then is that when I come back to my computer I log into windows but the password is actually being written to (HowTos)