Select value dynamically of a combobox

Hello,

i have a combobox in a form. The combobox is attached to a store which holds some elements. The elements are pair of kind "id", "name".

Hence i defined my combobox in such way

Code:

                    xtype: 'combobox',
                    fieldLabel: 'Type of User',
                    name: 'typeOfUser',
                    editable: false,
                    displayField: 'name',
                    queryMode: 'local',
                    store: 'mylocalstore',
                    valueField: 'id',
                    valueNotFoundText: '',

At certain point i receive from the server a json message holdin which user should be automatically selected. The server sends me the "id" of the user to be selected.

That's good. what i do is

Code:

combobox.setValue(selecteduser)

But then what i see is different from what i'm expecting to see.

Suppose i have the record ("3","Foo");

Suppose the server says "id:3", then i see "3", instead of "Foo".

Is there a way to do it?

I searched online and on the forum, but i didn't understand if there is an answer.

Select value dynamically of a combobox