jQuery Grid Plugin - jqGrid

Hi,

Hypothetical example:

In my grid, one of the column (columnname - SampleCol) has null (empty string) values in it. I am populating the grid using JSON.

There are 50 rows in the grid and 20 rows in SampleCol have null values in it.

When I sort the grid on SampleCol, the rows that have values are sorted correctly.

My question is, how do the rows that do not have values in SampleCol get sorted, what determines their order?

I know multi column sort is not implemented.

Thank you.