通过编程更改GLMStacker选项卡（魅力、Smalltalk）

我正试图以编程方式打开一个或两个选项卡，类似于这个工作示例

browser := GLMTabulator new.
    browser column: #blah.
    (browser transmit)
        to: #blah;
        andShow: [ :a |
        a list title: 'One'.
        a text title: 'Two'.
        tab := a.].
 browser openOn: Object.

browser panes last lastActivePresentation: browser panes last presentations last.

。。。但是有一个堆垛机，像这样：

browser := GLMTabulator new.
browser title: 'Prueba'.
browser column: #testColumn.
browser transmit
    to: #testColumn;
    andShow: [ :presentation | 
        | first second |
        first := #'first'.
        second :=  #'second'.
        innerStacker := GLMStacker new.
        presentation custom: innerStacker.
        innerStacker panes: { first . second }.
        innerStacker transmit
            to: first;
            andShow: [ :p | p title: first ].
        innerStacker transmit
            to: second;
            andShow: [ :p | p title: second ].
        "innerStacker selection: Dictionary.
        innerStacker selection: second." ].
browser openOn: #('first...' 'second...').

我试过不同的方法，但似乎都不管用。比如：

浏览器窗格最后一个活动演示文稿：innerStacker窗格最后一个演示文稿窗格。

或

innerStacker窗格最后一次活动演示文稿：innerStacker窗格最后一次演示文稿窗格。

有什么想法吗