kali hangs on using wifi usb adaptor in virtualbox.

Hello,
I am using kali linux as my host OS and is installed on the hard drive, and im using virtualbox inside kali and test on them but there is a problem with kali that, in normal wired lan the virtal machine or the guest OS works fine but when i mount the wifi usb in the guest OS the whole kali machine hangs out, i've had this problem in kali 1.0 and is still in 2.0.I've two wireless cards one is alfa and other is tplink but no matter which one i use it just hangs. when i do the same in my winodws or other linix distros they just work but only the kali system hangs.
can anyone give me some solution.
Thanks