Minor nuisance: NSMatrix cell order tag. 1- for first item, 0- for second item

I have a radio button group in my Cocoa App's UI.

When i intercept clicking on either of them, i query t开发者_开发知识库he selCell tag. For some reason it's always "0" for the second item, and "1" for the first. Shouldn't it be the other way around as the first item is, well, first?

You can set the Tag for the cells in Interface Builder if you want them to match your expectations.