如何将复选框列添加到Extjs Grid

Ext.create('Ext.grid.Panel', {
    title: 'My Checkbox Grid',
    store: myStore,
    columns: [
        // 添加复选框列
        {
            xtype: 'checkcolumn',
            header: 'Selected',
            dataIndex: 'selected',
            width: 100
        },
        // 其他列配置
        {
            text: 'Name',
            dataIndex: 'name',
            flex: 1
        },
        {
            text: 'Email',
            dataIndex: 'email',
            flex: 1
        }
    ],
    renderTo: Ext.getBody()
});

var myStore = Ext.create('Ext.data.Store', {
    fields: [
        { name: 'name', type: 'string' },
        { name: 'email', type: 'string' },
        { name: 'selected', type: 'boolean' }
    ],
    data: [
        { name: 'John Doe', email: 'john.doe@example.com', selected: false },
        { name: 'Jane Doe', email: 'jane.doe@example.com', selected: false },
        // 更多数据
    ]
});