Hi Vaibhav ,
I'm not sure about to activate position button for all non key fields. But there is a solution to sort your selected field without a button. Create new module inside PBO and write following code.
MODULE sort_data OUTPUT.
DATA: GT_XXX TYPE STANDARD TABLE OF XXX.
GT_XXX[] = EXTRACT[].
SORT GT_XXX BY A B C.
EXTRACT[] = GT_XXX[].
ENDMODULE.
If you say this is not enough then you should develop your own program with alv methods.
Regards
Sapromancer