ListBox DataTemplate绑定两个列表

I'm databinding a listbox to an object that contains two array of strings. Each listbox item is set to a data template made up of a textbox and a combo box. The first string array is bound to the list, and the second string array is bound to the combo box. Well, at least that's I'm trying to achieve. The problem is that I can't figure out the binding syntax to set the second array to the combo box. Here's what I have:I'm databinding a listbox to an object that con