[flexcoders] why does rowCount in DataGrid not match number of visible lines in grid

[hank williams]

I am trying to discover the number of lines visible in a DataGrid. The actual number is 5.75, meaning that the last row is 3/4 visible. The problem is that the rowCount property is 7. I would think that the answer would be either 5 or 6. but not 7. So I am wondering, how is this calculated? Am I interpeting this wrong?
Hank

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