我正在尝试按照简单的代码(修改自here)来创建一个窗口:packagemainimport("github.com/andlabs/ui")funcmain(){ui.Main(makeMainWin)}funcmakeMainWin(){varbmiButton=ui.NewButton("First")varotherButton=ui.NewButton("Second")//ui.NewVerticalStackdoesnotwork;stack:=ui.NewVerticalStack(ui.NewLabel("Selectmodule"),bmiButton,otherB