Sony S780 will not shuffle music over DLNA; surely that cannot be right .....

Can anyone find the control or option for this box to shuffle music over DLNA?
This feature was in the PS3, and my Bravia WE5 – which has only the most basic network features. It seems inconceivable that such a bread-and-butter playback mode is not included. Can anyone tell me what button I have missed?

Thanks