How to Connect WIFI Shield 101 With Xbee Shield on Arduino Mega 2560

How to Connect WIFI Shield 101 With Xbee Shield on Arduino Mega 2560.
Both the Shields are having ICSP Connector, and Arduino Board is only having one.
May be i may sound stupid, but how can i stack them all together, as both the xbee and wifi schield will only work if i connect them with ICSP to arduino board.
Kindly let me know is there any circuit or hack available for the same.