Ext.create('Ext.window.Window', {
            title: 'Enter test details',
            modal: true,
            width: 500,
            layout: 'fit',
            items: [
                {
                    xtype: 'form',
                    layout: 'vbox',
                    items: [
                        {
                            xtype: 'textfield',
                            fieldLabel: 'test',
                            name: 'input1',
                            margin: '10 10 10 10',
                            value: test
                        }
                    ]
                }
            ],
            buttons: [
                {
                    text: 'OK',
                    handler: function() {
                        var window = this.up('window');
                        var form = window.down('form').getForm();
                        var values = form.getValues();
                        currentRecord.setCurrentSublistValue({
                            sublistId: sublistName,
                            fieldId: 'custcol_test',
                            value: values.input1
                        });
    
                        window.close();
                    }
                },
                {
                    text: 'Cancel',
                    handler: function() {
                        this.up('window').close();
                    }
                }
            ]
        }).show();