How to get individual Cost of bundles selected items

Hi
I am using bundle products and add lot of product items in it. now i need to add two extra fields. in these field i need to pull bundle item price and cost (i am also using cost attribute)

I am able to get correct price of all products. but unable to get cost and cant understand how to get cost value. i am editing this file Root directory

app/design/adminhtml/default/default/template/bundle/product/edit/bundle/option/selection.phtml

please check screenshot for more understanding

Bundle Item
Attachment 3070

Best Regards