ExtJs grid.Panel store: keep scrollbar position after load/reload

I'm using grid.Panel in Sencha ExtJs 4.0.2a and I reload a Json Store every 60 seconds.

I was wondering if there is a way to preserve the position of the scrollbar after a data load.
So that the user can continue to look at the records he was looking before the load..

I reload the data in the grid using a Task:

var task = {
    run: function(){
        Ext.getCmp(panelGridId).getStore().load({
            //Callback function after loaded records
            callback: function(records) {
                //Hide grid if empty records
                if (Ext.isEmpty(records)) {
                    Ext.getCmp(panelGridId).setVisible(false);
                }
                else {
                    if (Ext.getCmp(panelGridId).isHidden()) {
                        Ext.getCmp(panelGridId).setVisible(true);
                        Ext.getCmp(panelGridId).doComponentLayout();
                    }
                }
            }
        });
    },
    interval: 60000 //60 seconds
};

Ext.TaskManager.start(task);

After the data load the scrollbar position is reset to the top..

Q: Is there a way to maintain the scrollbar position after the data load?

Thanks in advance!