Personas 3.0: 'GUIT': table .visibleRowCount does not have effect?

Hi Personas expert,

I am doing some testing and found this "issue":

Reproduce steps:

run tcode "GUIT", in "okcd" field type 1000, hit Enter key>Make a copy flavor, and add script code like:

var tbl=session.findById("id-of-table-on-ui");

tbl.visibleRowCount=8;  //default is 16

But this does not have effect on UI display - UI still show the table in 16 lines. However, if use

tbl.maxRows=8;

Then the UI will oonly show 8 lines now.

Question:  is .maxRows or .visibleRowCount that determintes how many rows of the table are to be displayed on UI?
Or this can be a bug?

Thanks.

Dong Zhu