About Filter

[torsilver]

I try to use Filter and FilterBar modules in my codes
when I got some new stores, I use
grid.model.clearCache();
grid.setStore(store);
grid.body.refresh();
to Refresh my grid.
But after the refresh the filter I set before refresh is gone.
Can some one tell me how I can keep the filter. So the grid will show new data and with filter.