Blankpos Not Working?

I think there may be a problem with advstringgrid.sortsettings.blankpos. I dropped a grid on a form, set goediting and then ran the program. I entered text in several rows of col 1 and left some rows blank. The problem is that blanks always sort to the top on an ascending sort -- regardless of the setting for advstringgrid.sortsettings.blankpos. Am I misunderstanding the function of that setting?

Please disregard -- I discovered that you need to use this option in conjunction with IgnoreBlanks.