trabule oops alv interactive report adding the totals into the grand total

hi,

i am facing the probulam oops alv intaractive report in that

first i am display the basic list using one custom container,

double click on the basic list its go to the secondary list

in the secondary list i am displaying in the single screen two

gride display, here i am facing the probulam is

in the secondarylist i am displaying two grid displays

in each grid display i am use the fieldcatlog table types,

for curancy fields total calculation i am use

it_fieldcat-DO_SUM = 'X'. here for that curancy feild give like

in the secondary list first grid display.

unit of cost

4565

7524

4578

5785

-

22452 total

-

in the secondary list second grid display.

unit of cost

4545

7525

4575

5785

-

22430 total

-

here i want add the two totals into grand totals

after displaying the two grid displays in the below like this

22452

22430

-

44882 grand total

-

like this plz help me.

thanks&regards.

raj