Day view grouped by room with order

Hi, there,

I am wondering if there is any way to sort Day view table columns with specific order?

I built a conference schedual time table in Day view: http://staging.codata2012.tw/session/day/2012-10-31
As you see, I disallowed items overlapping and grouped them with their rooms(terms). The room names appeared as column titles.

Hoever, I want to sort the columns in particular order: their term weight.
I added a sort criterion in views, but the result is not right: the colums still ordered by the event time.
A column would be move to left if it has a earlier event in it, no matter what term weight it has. It ignorded the sort criterion I have set.

Is there any possible way to adjust this problem and fulfil my request? Thanks.