    /**
     * A Column definition class which renders a numeric data field according to a {@link #format} string.
     *
     *     @example
     *     Ext.create('Ext.data.Store', {
     *        storeId:'sampleStore',
     *        fields:[
     *            { name: 'symbol', type: 'string' },
     *            { name: 'price',  type: 'number' },
     *            { name: 'change', type: 'number' },
     *            { name: 'volume', type: 'number' }
     *        ],
     *        data:[
     *            { symbol: "msft",   price: 25.76,  change: 2.43, volume: 61606325 },
     *            { symbol: "goog",   price: 525.73, change: 0.81, volume: 3053782  },
     *            { symbol: "apple",  price: 342.41, change: 1.35, volume: 24484858 },
     *            { symbol: "sencha", price: 142.08, change: 8.85, volume: 5556351  }
     *        ]
     *     });
     *
     *     Ext.create('Ext.grid.Panel', {
     *         title: 'Number Column Demo',
     *         store: Ext.data.StoreManager.lookup('sampleStore'),
     *         columns: [
     *             { text: 'Symbol',         dataIndex: 'symbol', flex: 1 },
     *             { text: 'Current Price',  dataIndex: 'price',  renderer: Ext.util.Format.usMoney },
     *             { text: 'Change',         dataIndex: 'change', xtype: 'numbercolumn', format:'0.00' },
     *             { text: 'Volume',         dataIndex: 'volume', xtype: 'numbercolumn', format:'0,000' }
     *         ],
     *         height: 200,
     *         width: 400,
     *         renderTo: Ext.getBody()
     *     });
     */
    Ext.define('Ext.grid.column.Number', {
        extend: 'Ext.grid.column.Column',
        alias: ['widget.numbercolumn'],
        requires: ['Ext.util.Format'],
        alternateClassName: 'Ext.grid.NumberColumn',

        /**
         * @cfg {String} format
         * A formatting string as used by {@link Ext.util.Format#number} to format a numeric value for this Column.
         */
        //<locale>
        format : '0,000.00',
        //</locale>

        defaultRenderer: function(value){
            return Ext.util.Format.number(value, this.format);
        }
    });