I have actioncolumn something like this:

```
{
    xtype: 'actioncolumn',
    align: 'center',
    items: [
        {
            getTip: function () {
                return 'this doesn\'t work';
            },
            handler: function() {
                // action 1
            }
        },{
            tooltip: 'works',
            handler: function() {
                // action 2
            }
        }
    ]
}

```

[getTip()](http://docs.sencha.com/ext-js/4-1/#!/api/Ext.grid.column.Action-cfg-items) method I found in documentation, but it doesn't work or I don't know how to use it. What I am doing wrong or how can I set tooltip?