Problem in Hook.js, trying to access missing Ext classes

[hepplk]

Here is the relevant code...

in the Hook.js on the 'PortalMenu' rendered event,

        exportController = Portal.getApplication().getController('WMS.util.export.controller.Main');
        exportController.init();
        exportController.onLaunch();

this obviously calls the init and onLaunch functions on the 'exportController',

    init: function() {

        this.control({
            '#exportCancelButton': {
                click: this.onClickCloseWindow
            },
            '#initExportButton': {
                click: this.onExportButtonClick
            },
            '#pdfRadioButton': {
                change: this.onFormatSelected
            },
            '#xlsxRadioButton': {
                change: this.onFormatSelected
            }
        });

    }

    onLaunch: function() {

        var columnStore = Ext.create('WMS.util.export.store.Column');
        Ext.create('WMS.util.export.store.PageSize');
        Ext.create('WMS.util.export.store.PageOrientation');

        // Subscribe to datachanged event to automatically update the item selector;
        columnStore.on({
            datachanged: this.onDataChange,
            scope: this
        });

        return Ext.create('WMS.util.export.view.Window');

    }

as you can see this then creates the 'exportWindow' or 'WMS.util.export.view.Window'. In this window we create a 'form' with a 'tabPanel' and it is when the 'tabPanel' is being created we are getting the error that I mentioned.

xtype: 'form',
            itemId: 'exportForm',
            layout: 'fit',
            items: [{
                xtype: 'tabpanel',
                bodyPadding: 10,
                defaults: {
                    layout: 'fit',
                    style: {
                        padding: '10px'
                    }
                },
                deferredRender: false,
                height: 200,
                itemId: 'exporttabpanel',
                layout: 'fit',
                tabPosition: 'left',
                tabBar: {
                    cls: 'wms-vertical-tabbar'
                },
                items: [{...

I have seen a similar error in another on the posts on the forum - http://cnxforum.com/showthread.php?1...g-Login-Window - I have tried the steps suggested in this post but it seems to prevent the Hook.js from working...