Problem setting font size in TDBAdvGrid at design time

I seem to be unable to set font.size at design time. No matter what number I place in there, when I run the application, the font size has not changed. I do notice that when I set larger numbers in font.size, the font.height field seems to go more negative, so maybe it has something to do with that.

Font is managed per column and set with DBAdvGrid.Columns[x].Font