Make all rows height be fixed in a table

I have a rows in table populated from a data array rows are not fixed but dynamic.
Below code hardcodes the rows, how can I achieve height 15 for all “n” rows?
$(go.RowColumnDefinition, { row: 0, height: 15 }),
$(go.RowColumnDefinition, { row: 1, height: 15 }),

Set the GraphObject.height in the Panel.itemTemplate.