UIDatePicker on iOS6

Added to prevent an exception described below on iOS6 when using
UIDatePicker

2014-03-03 15:03:08.546 GRR[2163:907] *** Terminating app due to
uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSProxy
doesNotRecognizeSelector:tableView:numberOfRowsInSection:] called!'
*** First throw call stack:
(0x3ecd012 0x5793e7e 0x3eccdeb 0x391249d 0x3ebcbbc 0x3ebc94e 0x2f726e8
0x2f753c4 0x2e39fa2 0x2e3992c 0x2e3d426 0x2e420ce 0x715504 0x7253f6
0x2dde92d 0x57a76b0 0x41f8fc0 0x41ed33c 0x41f8eaf 0x313d36e 0x3136708
0x31379a4 0x3139812 0x31398a1 0x31398eb 0x3133087 0x2e9c996 0x2e9c439
0x2577a5 0x22b2ac 0x3cb18 0x2e3d8d5 0x2e3db3d 0x3844e83 0x3e8c376
0x3e8be06 0x3e73a82 0x3e72f44 0x3e72e1b 0x6a3e7e3 0x6a3e668 0x2d8e65c
0x12c715 0x5a3d701)
libc++abi.dylib: terminate called throwing an exception