    /**
     * @class Ext.grid.column.Number
     * @extends Ext.grid.column.Column
     *
     * A Column definition class which renders a numeric data field according to a {@link #format} string.
     *
     * {@img Ext.grid.column.Number/Ext.grid.column.Number.png Ext.grid.column.Number cell editing}
     *
     * ## Code
     *     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()
     *     });
     *
     * @xtype numbercolumn
     */
    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
         * (defaults to <code>'0,000.00'</code>).
         */
        format : '0,000.00',
        constructor: function(cfg) {
            this.callParent(arguments);
            this.renderer = Ext.util.Format.numberRenderer(this.format);
        }
    });