How to style a grid after refreshing it?

Hi,

I'm using the following code to style a grid based on its content :

Code:

    viewConfig: {
        getRowClass: function(record, rowIndex, rowParams, store){
            switch(record.get('status')){
                case 'PENDING':
                    return 'row-yellow';
                case 'REJECTED':
                    return 'row-red';
            }
        }
    },

The problem is that I can't call this method when I refresh the grid. I tried the following but it doesn't work.

Code:

var store = grid.getStore();
var i = 0, record = '';
while(record = store.getAt(i)){
       grid.viewConfig.getRowClass(record,i,{},store);
       i++;
}

How can I fix this?

Thanks