Adding data to grid

Hi
I have made this multi-frame flash application.
In one of the frames I am adding data to the grid using addItem
I used trace(grid) for getting the instance but when I switch to this frame back from any other frame I am getting various instances and hence the code written in this frame doesnt executes anymore
_level0.instance9.grid
_level0.instance105.grid
_level0.instance199.grid
_level0.instance293.grid
_level0.instance387.grid
_level0.instance481.grid
_level0.instance575.grid
Is there anyway I can make sure that whenever I come to this frame, my data gets added to the grid
Thanks