Button Grayed out for advanced options

Hi,

My "More Advanced Options" button is grayed out.....


I am trying to set up a complex filter with color categories in Outlook 2007
in the calendar view.
The aim is to get a view, that displays items belonging to more than one
category in a preferred category color.

In Outlook 2003 there was an option that allowed you to go to advanced
oprions and then choose "field", you then entered one or more criteria.
Underneath it was another "more advanced"button, that allowed you to choose
an "and" or "or operator.

However, that button is grayed out.
Anyone who knows how to get this button operable?

I am running MS XP SP2 on a Dell Inspiron 1150 2 GHz RAM, Office 2007
Ultimate.

Assistance and suggestions are welcome....

Thanks,
Pearl