// the same window is used for adding a new record and updating an
    // existing record. bit of a hack to make sure all tabs are treated as
    // being in the same form wrt ajax submission.

    var generate_win = function() {
        return new Ext.Window({
            title: 'Edit [% lf.main.title %]'
            ,id: 'main-win'
            ,collapsible: true
            ,closable: true
            ,width: 400
            ,modal: true
            ,autoHeight: true
            ,layout: 'fit'
    
            // form
            ,items: [{
                xtype: 'form'
                ,id: 'form-panel'
                ,border: false
                ,url: '[% c.uri_for( c.controller('LFB::Root').action_for('db_picker'), db, lf.main.path, "update" ) %]'
                ,autoHeight: true
                ,layout: 'fit'
    
                // tabpanel
                ,items: [{
                    xtype: 'tabpanel'
                    ,activeTab: 0
                    ,border: false
                    ,deferredRender: false // submit all tabs as one form
                    ,autoHeight: true
    
                    // tab defaults
                    ,defaults: {
                        layout: 'form'
                        ,bodyStyle: 'padding: 5px;'
                        ,defaultType: 'textfield'
                        ,buttonAlign: 'right'
                        ,autoHeight: true
                        ,hideMode: 'offsets'
                        //,labelWidth: 80
                        //,labelAlign: 'right'
                    }
    
                    ,items: tabs
                }]
    
                ,buttons: [{
                    text: 'Save'
                    ,handler: function(){
                        Ext.getCmp('form-panel').getForm().submit({
                            waitMsg: 'Saving Data...'
                            ,clientValidation: false
    
                            ,success: function(){
                                Ext.Msg.alert(
                                    'Success', 'Changes have been saved.',
                                    refreshandclose
                                );
                            }
    
                            ,failure: function(){
                                Ext.Msg.alert(
                                    'Error', 'Changes have not been saved!');
                            }
                        });
                    }
                },{
                    text: 'Cancel',
                    handler: function(){
                        Ext.getCmp('main-win').close();
                    }
                }]
            }]
        });
    };