Fieldset with JSON data doesn't show anything

[AlexLans]

I have the following container:

Ext.define("NormaMob.view.panel_mpi", {    extend: "Ext.Container",
    alias: "widget.panel_mpi",


    config: {
        ui: 'dark',
        height: 42,
        layout: {
            type: 'vbox'
        },
    },


    initialize: function () {
        
        var ptName = Ext.create('Ext.field.Text', {
            label: 'Naam:',
            name: 'namestring'
        });
        
        var ptID = Ext.create('Ext.field.Text', {
            label: 'Patiëntnummer:',
            name: 'patientnumber'
        });


        var generalPatientData = Ext.create('Ext.form.FieldSet', {
            title: 'Patiëntgegevens',
            defaults: {
                labelWidth: '25%'
            },
            items: [
                ptName,
                ptID
            ]
        });
        
        
        this.add(generalPatientData);
        this.callParent(arguments);


        this.Update = function (context) {
            console.log('update MPI');
            generalPatientData.setRecord(context);
            //this.setData(context);
        };


        //Add the patientcontroller to the list of observers
        var ptManager = new patientmanager();
        ptManager.addObserver(this);


        console.log("panel_mpi intialized");
    }
});

When the Update function is called the context parameter contains a valid JSON object.
snapshot.PNG

Both the textfields won't show the data. What am I missing here? Please advise.
Thank you

[mitchellsimoens]

setRecord wants a record not an object, if you are just going to have an object, use setValues instead.