static/ext/src/toolbar/Paging.js
function(){
        var me = this,
            current = me.store.currentPage;

        if (me.fireEvent('beforechange', me, current) !== false) {
            me.store.loadPage(current);
        }
    }
function(){
        var me = this,
            current = me.store.currentPage;

        if (me.fireEvent('beforechange', me, current) !== false) {
            me.store.loadPage(current);
        }
    }
Refresh the current page, has the same effect as clicking the 'refresh' button.