i have aproblem loading a Combobox value in a form with Json nested Object.


when i do


Code:
myForm.getForm().load({         
                       url: 'Requisition/GetRequisition',
                        params: {
                            reqID: data
                        },
                        failure: function (form, action) {
                            Ext.Msg.alert("Load failed", action.result.errorMessage);
                        }
                    });
i receive a Json string like this:




Code:
{"success":true,"data":{"reqNumber":8,"requisitor":"Jerry.Gomez","reqDepartment":{"id":5,"name":"Department 05"},"requestDateString":"2012/06/14","projectCustomer":{"id":10,"name":"Customer 06"},"project":{"projectID":7,"name":"Project 07"},"itemQuantity":0,"lastReqNumber":0}}
which is supossed to go to a form with several comboboxes that are supossed to change the display values to those their just received from the load, theese combobox values were already prepopulated from a store.


the thing is that i have a combobox which is receiving the value: "requisitor":"Jerry.Gomez" which shows into the combobox display value but there is other comboboxes that receive nested objects like: "reqDepartment":{"id":5,"name":"Department 05"}, which i have no idea how to make them show for display value, here is my code for the comboboxes.


this one is the one that works fine
Code:
var requestorReq_combo = Ext.create('Ext.form.field.ComboBox', {
    id: 'requestorReqCmb',    
    store: usersAdCombo_store,
    name: 'requisitor',
    hiddenName: 'username',
    valueField: 'username',
    displayField: 'concat_name',
    label: 'Requestor', fieldLabel: 'Requestor',
    allowBlank: false, blankText: msgFldReq_, emptyText: msgCmbDefault_, selected: 0,
    typeAhead: true, mode: 'local', forceSelection: true, triggerAction: 'all', selectOnFocus: true,
    width: 220
});


and this one that isnt displaying the values.

Code:
var departmentReq_combo = Ext.create('Ext.form.field.ComboBox', {
    id: 'departmentReqCmb',
    name: 'reqDepartment.id',    
    store: departmentCombo_store,
    hiddenName: 'id',
    valueField: 'id',
    displayField: 'name',
    label: 'Department', fieldLabel: 'Department',
    allowBlank: false, blankText: msgFldReq_, emptyText: msgCmbDefault_, selected: 0,
    typeAhead: true, mode: 'local', forceSelection: true, triggerAction: 'all', selectOnFocus: true,
    width: 220
});


i had a similar case for stores that loaded values into a grid, i used a mapping tag into the model to read the nested objects, but since im not using a model into the form, i have no idea on how to do it.


sorry if i didnt quite explained myself in here im a begginer with ExtJS.