I had so many problems with GenyMotion that do not occur on a real device (try with the Licensing library and you'll see) that I completely given up this emulator. So you should'nt worry about this if that works well on your device. That being said, TabHost is a well-known focus stealer (in ICS the bug was still there; in JellyBean, I didn't try so I don't know).
For me, the official emulator with the Intel Accelerator is good enough for my use. Not as fast as GenyMotion, but a lot more reliable.