Q: iCal problem with ordering of multiple all day events

I have multiple all-day events that overlap from different calender's, and there doesn't seem to be a rhyme or reason as to which ones are on top of each-other, which makes it very confusing to look at (in month view in specific).

Here's a pic for an example of what I'm talking about;

I'm wondering, how can I arrange the order of multiple all day events on my calender.

Thanks,