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.