Hey all, 

I'm having a bit of trouble trying to figure out where to start on writing a trigger that would display the sum of all orders for a given Account on the Account page.  I've created a custom currency field on the Account record "Order_Grand_Total__c" but actually populating that field via apex trigger is where I'm stuck.  I thought I'd be able to do a roll-up summary field but it appears that only works with the Opportunities object and not the standard Order object.

Any help in the right direction is much appreciated!!