ListGrid: Dynamic CSS Style for Header Cell

[tigran.babloyan]

Hi, is it possible to have a custom css styles applied for the ListGrid header dynamically ?
I want something similar to the ListGrid.getCellStyle(record, rowNum, colNum) but which is applied for cell headers.

And if there is no API for that how can I apply different css style for the header cells of the ListGrid ?

Want I want is a bold title for some of the columns in the ListGrid.