Grid buffered/infinite scrolling in 4.1

[filippo.ferrari]

My solution was switch to "beforeprefetch" event:

me.getStorePianiInfiniteStore().on({

    beforeprefetch: function (store, operation, opts) {

        Ext.apply(operation, {
            params: {
                numero: me.getNPiano().getRawValue(),
                dt1: Ext.Date.format(me.getDataDa().getValue(),'Ymd'),
                dt2: Ext.Date.format(me.getDataA().getValue(),'Ymd'),
                ....
            }
        });
    }