Creating new grid bases on selection of records from existing grid

Hi can any one help me with this requirment.I have a grid with with checkbox and based on selection of records i should create a new grid. Assume that i have a first grid with 10 records and i have selected two records with this two records i need to create a new grid.For that iam creating a new store by copying selected records like this.





var records = []; store.each(function(r){ records.push(r.copy()); }); var store2 = new Ext.data.Store({ recordType: store.recordType }); store2.add(records);The issue is iam getting an error like proxy is undefined.