Diable a ComboBox through RadioGroup

[jovasnimaro]

hi, i want to disable a comboBox when i select a radiobutton from a radioGroup but when i execute the code launches me the next error:

Uncaught TypeError: Cannot call method 'setDisable(true)' of undefined

My code is next:

Ext.create( 'Ext.form.Panel',{
    alias: 'widget.addewr',
    title: 'Add EWR',
    border: false,
    items:[    
    
    {
            xtype:'form',
            width: '500',
            border: false,
            items: [            
            {
                xtype: 'radiogroup',
                // Arrange radio buttons into two columns, distributed vertically
                columns: 1,
                vertical: true,
                items: [
                {
                    boxLabel: 'Validation',
                    name: 'val',
                    width: 400,
                    inputvalue: 1
                },
                {
                    xtype: 'form',
                    layout: 'hbox',
                    border: false,
                    items: [
                    {
                        //add combobox Select Validation phase
                        xtype: 'combobox',
                        name: 'validationcombo',
                        anchor: '100%'
                    },
                    {
                        xtype: 'splitter'
                    },
                    {
                        //add combobox Level
                        xtype: 'combobox',
                        name: 'levelcombo',
                        anchor: '100%'
                    }
                    ]
                },
                {
                    xtype: 'splitter'
                },
                {
                    // add the radio button for Verification
                    name: 'val',
                    boxLabel: 'Verification',
                    anchor: '100%',
                    inputvalue: 2,
                    checked: true,
                    listeners: {
                        click: {
                            element: 'el',
                            fn: function(){
                                console.log('click el');
                                var x = Ext.getCmp('validationcombo').setDisable(true);
                                console.log(x);
                            }
                        }
                    }
                }]            
        }]
        }]
});

Thanks!!

[jovasnimaro]

Sorry, solved, i was forgetting the id property in each element.

Thanks for reading.

Regards!!!!

Jovani