[{
    "text": "Name",
    "flex": 1,
    "dataIndex": "name",
    "width": 100,
    "xtype": "",
    "items": null
}, {
    "text": "Email",
    "flex": 0,
    "dataIndex": "name",
    "width": 100,
    "xtype": "",
    "items": null
}, {
    "text": "Phone",
    "flex": 0,
    "dataIndex": "phone",
    "width": 100,
    "xtype": "",
    "items": null
}, {
    "text": "Actions",
    "flex": 0,
    "dataIndex": "",
    "width": 50,
    "sortable": false,
    "xtype": "actioncolumn",
    "items": [{
        "iconCls": "x-fa fa-check green",
        "handler": "onApprove"
    }, {
        "iconCls": "x-fa fa-check red",
        "handler": "onDecline"
    }]
}]