How to filter ExtJs GridPanel/ExtJs Store?

I'm new to ExtJs. I have a GridPanel which is binded with a data store. I have a checkboxgroup, which containts the possible values of the GridPanel row. I want to filter the GridPanel with the checkboxgroup values.

Here is the code -

Store1 = new Ext.data.JsonStore({
url: 'CustomerProfiles/GetDetails',
root: 'rows',
fields:['Name','Id']
});

DetailedResults =
                {
                    xtype: 'grid',
                    autoHeight: true,
                    autoWidth: true,
                    autoScroll: true,
                    border: false,
                    trackMouseOver: false,
                    frame: true,
                    store: Store1,
                    columns: [
                        { header: 'Name', dataIndex: 'Name', width: 90 },
                        { header: 'Id', dataIndex: 'Id', width: 50 }
                    ]
                };

Leftpanel = new Ext.Panel({
id: 'Leftpanel',
frame: true,
width: 175,
items: [
        {
            xtype: 'label'
        },
        {
            xtype: 'checkboxgroup',
            columns: 1,
            vertical: true,
            items: [{
                boxLabel: 'ALL',
                name: 'chkName',
                inputValue: 'all'
            }, {
                boxLabel: 'N1',
                name: 'chkName',
                inputValue: 'N1'
            }, {
                boxLabel: 'N2',
                name: 'chkName',
                inputValue: 'N2'
            }, {
                boxLabel: 'N3',
                name: 'chkName',
                inputValue: 'N3'
            }], listeners: {
                change: {
                    fn: function () {
                        Store1.clearFilter();
                        var selectedValue = this.getValue();
                        for (var i = 0; i < selectedValue.length; i++) {
                            Store1.filter('Name', selectedValue[i].inputValue);
                        }
                    }
                }
            }             
        }            
]});

Where I went wrong?

PS: I am using 3.4 version