Sencha Architect 2.1.0
ExtJS 4.1.2

Hi,
This is a simple question which seems to be asked often, but reading the answers, I don't have a clear answer yet.
I'm using sencha architect to create a basic form for ExtJS.

I'm creating a form panel in architect. I've put a field container underneath it, and then added a vertical column of various types of fields (checkboxes, text, numeric).

I want to set the label width for all of those fields in one place.

I *thought* that the docs, and people's comments, suggest that labelWidth on the fieldContainer should achieve this, but it doesn't seem to.

I vaguely recall in Touch 1 that I would configure default attributes for children on the parent, but I can't see any hint of that in ExtJS/SA right now.

Is there any easy way of doing this?

Thanks

Code:
 {
                            xtype: 'panel',
                            title: '!Configuration',
                            items: [
                                {
                                    xtype: 'form',
                                    height: 551,
                                    itemId: 'config_form',
                                    layout: {
                                        align: 'stretch',
                                        type: 'vbox'
                                    },
                                    bodyPadding: 10,
                                    items: [
                                        {
                                            xtype: 'fieldcontainer',
                                            height: 283,
                                            layout: {
                                                align: 'stretch',
                                                type: 'vbox'
                                            },
                                            labelAlign: 'left',
                                            labelWidth: 300,
                                            items: [
                                                {
                                                    xtype: 'checkboxfield',
                                                    fieldLabel: 'Bar'
                                                },
                                                {
                                                    xtype: 'checkboxfield',
                                                    fieldLabel: 'Foo'
                                                },
                                                {
                                                    xtype: 'checkboxfield',
                                                    fieldLabel: 'Longer Foo, etc'
                                                },
                                                {
                                                    xtype: 'checkboxfield',
                                                    fieldLabel: 'Foo'
                                                },
                                                {
                                                    xtype: 'checkboxfield',
                                                    fieldLabel: 'Bar'
                                                },
                                                {
                                                    xtype: 'numberfield',
                                                    fieldLabel: 'Bar longer bar whatever'
                                                },
                                                {
                                                    xtype: 'numberfield',
                                                    fieldLabel: 'Foo'
                                                }
                                            ]
                                        }
                                    ]
                                }
                            ]
                        }