How can I calculate the number of rows in a DataGrid.

I don’t mean the dgNumberOfLines as this is just the number of rows containing 
data.

I actually need the number of visible rows. The DataGrid can be resized by 
script.

It is straightforward where the height of the header and the height of a row is 
fixed but I was hoping the information may be a property of the DataGrid but I 
can’t seem to fined one.


Thanks

Terry
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