Table: Convert a row to a header row?

I can't figure out if a row can be converted to a header row, similar to locking title position in AppleWorks, in either Pages or Numbers. Locked title position in an AppleWorks spreadsheet is not recognized as a header row in Numbers (must go leave feedback on that one - done, & added the bit about converting to a header row/column). I could, though, add the header row & then drag the first row into the header row & delete the now empty first row. Because copying the text also copied the filler color, I used the fill color option in the object inspector to color the cells in that row.