Hi ! This pluggin seems to be exactly what I need, but I can't make it work :-( I'm a total newbie to EXtJS so, I know the problem is on my side. Probably with my data store. Here's the code that I use :

Code:
Ext.onReady(function() {

    var movieStore = new Ext.data.Store({
                    url: 'movies.json',
                    reader: new Ext.data.JsonReader({
                        root: 'rows',
                        id: 'id'
                    }, [
                            'id',
                            'coverthumb',
                            'title',
                            'director',
                            { name: 'released', type: 'date', dateFormat: 'Y-m-d' },
                            'genre',
                            'tagline',
                            { name: 'price', type: 'float' },
                            { name: 'available', type: 'bool' }
                    ])
                });

                movieStore.load();

                var grid = new Ext.grid.GridPanel({
                    renderTo: document.body,
                    frame: true,
                    title: 'Movie Database',
                    height: 300,
                    width: 800,
                    enableColumnMove: true,
                    store: movieStore,
                    plugins: [new Ext.ux.grid.GridHeaderFilters()],
                    cm: new Ext.grid.ColumnModel([{
                        id: 'title',
                        header: "Titre",
                        width: 300,
                        sortable: true,
                        dataIndex: "title",
                        filter: { xtype: "textfield", filterName: "title" }
                    }, {
                        id: "director",
                        header: "Realisateur",
                        width: 200,
                        sortable: true,
                        dataIndex: "director",
                        filter: { xtype: "textfield" }
                    }, {
                        id: "released",
                        header: "Date de sorti",
                        width: 75,
                        sortable: true,
                        dataIndex: "released",
                        renderer: Ext.util.Format.dateRenderer('m/d/Y'),
                        filter: { xtype: "textfield" }
                    }, {
                        id: "genre",
                        header: "Genre",
                        width: 100,
                        sortable: true,
                        dataIndex: "genre",
                        filter: { xtype: "textfield" }
                    }])
                });


            });   //end onReady
This sample comes from a book, but I think it's not really up to date.

The grid is displayed. But the filters don't work. When I enter som text in the second filter field and hit the enter key, the filter fields get highlighted but, the data just stays the same.

Thanks a lot for you help !