If I have my dataprovider in the following manner:

var dataProvider = [{Date: "02-12-2007", Company1: 20, Company2: 30},
                    {Date: "02-09-2007", Company1: 20, Company2: 30},
                    {Date: "02-08-2007", Company1: 20, Company2: 30}]

How can I determine programatically:

1. The number of companies.
   I dont't seem to be able to figure out how to find the number of 
items in a particular element of the ArrayCollection.

2. Is there a way to structure the dataProvider so that I can also 
include the company names. Thus, I can use those names for my legend.

Thanks.
                             
                

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