This sounds similar to what I want to do.

I am trying to work out if it is possible in the scheduler to have three header columns. It seems as if you can only have two according to the group by.

- Day Header -
-Hour Header -
-Minute Header-

e.g.

Friday,1 May2009
6 79 9 10 11 12
0 30 0 30

etc.

This is handy because if you create some events in day view (where you have 15 or 30min) increment blocks you cannot create events at the same precision when switching to a multi day view. Currently you either have to give up the day header (which is useless in a multi day view) or the hour view, which again is not usable.

This would be a great feature.

I ended up doing this by using the BeforeTimeHeaderRenderEvent

if (!e.IsColGroup)
{
string hour = "";
if (e.Start.Minute == 0)
hour = e.Start.Hour.ToString();
e.InnerHTML = String.Format("<div >{1}</div><br/><span style='color:gray; font-size:8pt'>{0}</span>", e.InnerHTML, hour);
}

with the scheduler settings

CellDuration="30" and CellGroupBy="Day"

Maybe this will give someone some ideas.