Underline Grid Column Header Text by Code

Hi,

I am using Grid object.. and i am sorting all column's wise data on click event of all Grid Column headers.but i dont' have any option to show that this column has been sorted. my means that in a SAP b1 Grid there is red color picture come on column header when columns are sorted.so user knows that this column is sorted... i am also using Grid object.. so i want to show that this column is sorted then how it is possible.... i am trying to change header Caption with underline... but i am not able to do this... so please tell me is this possible to change column header text in Underline format by code.... if u have other view to show this column is sorted.

then please tell me.........

Ur efforts are apreciated in advance...

thnx

deepak