Store - Remove All Similar Values - Help!!?!

[Tbaseflug]

I am despertely trying to remove all records in a store that share a similar "PackageID" value - so, whatever value is passed into the function - all records with a similar value - remove from the store - I am trying the below, but every step I take I get JS errors:

var deleteselectgroup = function (val) {
            var group = Ext.getCmp('GridPanel2').store.getById(val).get('PackageID');
            Ext.getCmp('GridPanel2').store.query("PackageID", group).each(function (record) {
                Ext.getCmp('GridPanel2').store.remove(record);
            });
        }

[Tbaseflug]

Still can't get it... I receive an error Unable to get value of the property 'get': object is null or undefined"

[RCN]

Can you provide a running example?