What good does a row that's 1 pixel high in a datagrid do? Can you explain what you are trying to accomplish with this 1 pixel high row? There may be something that the datagrid can do that you are overlooking (or unaware of).
Normally, you can't really adjust the height of a grid row, and usually you wouldn't want to because it will contain varying data. Forcing a height could cut off your data. Plus, I don't think the rules of HTML would allow you to "clip" the contents of a cell without explicitly setting the clipping style attribute.
Peter
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Work smarter, not harder