Connecting a Dojo data.objectStore or data.ItemFileWriteStore to a grid

Question

I am trying to connect a dojo 1.7 objectStore or itemFileWriteStore to a grid but I;m not sure what I'm doing wrong.

When I run my code below using the ItemFileWriteStore, I get the grid headers but I dont see my data. When I use ObjectStore, the grid isnt there.

What am I doing wrong?

UPDATE: just noticed that the store.data attribute is empty. Must mean the format of of my "dataBucket" could be wrong?

require(['dojo/on'
            ,'dojo/ready'
            ,'dojo/dom'
            ,"dojo/data/ObjectStore"
            ,"dojo/store/Memory"
            ,"dojox/grid/DataGrid"
            ,"dojo/data/ItemFileWriteStore"
            ],
            function (on,ready,dom,objStore,memStore,grid,itemStore){
                ready(function(){
                    var dataBucket = {//idProperty: 'ID',  //for object store?
                                      identifer: 'ID', //for itemStore
                                      items : [
                                          {ID : '100', col2 : 'Ciao Ciao'},
                                          {ID : '200', col2 : 'Hello'}
                                      ]};

                    var stuff = new itemStore({data : dataBucket});
                    //var stuff = new objStore({store : dataBucket});
                    //var stuff = new memStore({data : dataBucket});

                    var layout = [[
                            {'name':'ID','field' : 'ID','width' : '100px'},
                            {'name':'Stuff','field' : 'col2','width' : '100px'}
                        ]];
                    var myGrid = new grid({
                                id: 'grid',
                                store: stuff,
                                structure: layout,
                                rowSelector: '20px'},
                            document.createElement('div')
                    );

                    dojo.byId("bottomPane").appendChild(myGrid.domNode);

                    myGrid.startup();                        })
                })
            }
        )