gistfile1.txt

    var states = Ext.create('Ext.data.Store', {
        fields: ['abbr', 'name'],
        data : [
            {"abbr":"AL", "name":"Alabama"},
            {"abbr":"AK", "name":"Alaska"},
            {"abbr":"AZ", "name":"Arizona"}
        ]
    });

    // Create the combo box, attached to the states data store
    var combo = Ext.create('Ext.form.ComboBox', {
        fieldLabel: 'Choose State',
        store: states,
        queryMode: 'local',
        displayField: 'name',
        valueField: 'abbr',
        renderTo: Ext.getBody()
    });

    var text1 = Ext.widget({
        xtype: 'textfield',
        renderTo: document.body
    });

    var text2 = Ext.widget({
        xtype: 'textfield',
        renderTo: document.body
    });


    combo.on('blur', function() {
        console.log('combo blurred');
    });

    text1.on('blur', function() {
        console.log('text1 blurred');
    });

    combo.focus();
    text1.focus();
    text2.focus();