i had a popup that looks like this : 

```
items : [{

    xtype: 'form',
    title: 'Upload a Photo',
    width: 400,
    bodyPadding: 10,
    frame: false,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'filefield',
        name: 'photo',
        fieldLabel: 'Photo',
        labelWidth: 50,
        msgTarget: 'side',
        allowBlank: false,
        anchor: '100%',
        buttonText: 'Select Photo...'
    }]
}]

```

i only copied the example in sencha docs but when i run it, it gives me this : 

![enter image description here](https://i.stack.imgur.com/YwFt3.png)

instead of this : 

![enter image description here](https://i.stack.imgur.com/4MLOo.png)

my concern is that the button 'choose file' displayed instead of 'select photo'

how can i solve this.. ?