How to make an editable TemplateColumn in a GridPanel?

[KBorkiewicz]

In my model, I have STREET, CITY, STATE, ZIP, and I want to display them in a single column in my GridPanel in the format:
STREET
CITY, STATE ZIP

That's easy enough to do with TemplateColumn.
However, I want each of these fields to be editable, individually. Is there a way to do this?

<-see this image for an example row

[KBorkiewicz]

What I mean is, I want the formatting of my rows to look like this: (<- click to see image)
But I want the address to have separate editable fields for street, city, state, and zip code.

[KBorkiewicz]

So I take it this is not possible...