Selectfield defaul valueField - displayField

Hi everbody, I have a question, I can't find information about set default value in my selectfield from the store, this is my code:

Selectfield: Data1,Data2,Data3,Data4

I want to make Data3 by default in the displayField.

Code:

---

{        xtype: 'selectfield',
        label: 'Subject',
        name: 'Name',
        valueField : 'Code',
        displayField : 'Desc',
        placeHolder: 'Choose',
        store : store1,
        activeItem: 0
    }

---

Hope you can help me.
Thanks in advance.

Use the value config on the select field.

Hi mitchellsimoens, thanks for the reply, but still not working, if I use value config, only show me this:

Attachment 34694

Code:

---

xtype: 'selectfield',        label: 'Asesor',
        value: 2,
        valueField : 'Codigo',
        displayField : 'Descripcion',
        placeHolder: 'Seleccione',
        store : asesoresStore

---

2 is my valuefield that I want to show.
Thanks again.