Cell editor problem

Hi, I generated a basic app with Sencha CMD, and basically copied the 'cell editing' example from the kitchen sink, works fine, except that I cannot click or select anywhere in the activated editor using the mouse (but I can control the cursor and selection with the keyboard). Any ideas?

Code:

Ext.define('Test.view.main.Main', {
    extend: 'Ext.container.Container',
    xtype: 'app-main',


    requires: [ 'Ext.grid.*', 'Ext.data.*', 'Ext.util.*', 'Ext.form.*' ],

    items: [{
        xtype: 'gridpanel',

        store: new Ext.data.ArrayStore({
            fields: ['fullName', 'short'],
            data: [ ['John Doe', 'JD'], ['Lisa Jobs', 'LJ'], ['Thomas Mitch', 'TM'] ]
        }),

        plugins: [{
            ptype: 'cellediting'
        }],

        columns: [{
            text: 'Name',
            width: 300,
            dataIndex: 'fullName',
            editor: {
                allowBlank: false
            }
        }, {
            text: 'Short',
            width: 300,
            dataIndex: 'short',
            editor: {
                allowBlank: false
            }
        }]
    }]
});

Cell editor problem