Midi from iDJ Live to IO Dock 2

I'm using DJay Pro on my iPad that is mounted in the IO Dock 2 so I have great audio-output. Now I bought a iDJ Live from Numark that is normaly connected with a usb-mini to a 30-pin connector.

Of course I wan't best of both worlds... So I have a UBS-mini cable from the iDJ Live to USB-B that's connected to the USB-midi port from the IO Dock. But it won't work.
Djay pro doesn't recognised the midi input...

Does anyone have a solution?
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