Inspect "[ERROR] Adding an event listener to a proxy that isn't already in the context"

app.coffee

do ->
    tabGroup = Ti.UI.createTabGroup()

    # Tab params
    tabParam = [{
        title: "Left"
        window: Ti.UI.createWindow
            title: "Left"
            backgroundColor: "#FFFFFF"
    }, {
        title: "Right"
        window: Ti.UI.createWindow
            title: "Right"
            backgroundColor: "#FFFFFF"
    }]

    ###
    内包表記で書くとエラーが出る
    ###
    # tabGroup.containingTabs = (Ti.UI.createTab val for val in tabParam)
    # tabGroup.addTab tabGroup.containingTabs[idx] for val, idx in tabGroup.containingTabs

    ###
    内包表記を使わずに、ばらして書いてもエラーが出る
    ###
    # tab0 = Ti.UI.createTab tabParam[0]
    # tab1 = Ti.UI.createTab tabParam[1]
    # tabGroup.containingTabs = [tab0, tab1]
    # tabGroup.addTab tabGroup.containingTabs[0]
    # tabGroup.addTab tabGroup.containingTabs[1]

    ###
    素直に書けばエラーが出ない
    ###
    tab0 = Ti.UI.createTab tabParam[0]
    tab1 = Ti.UI.createTab tabParam[1]
    tabGroup.tab0 = tab0
    tabGroup.tab1 = tab1
    tabGroup.addTab tabGroup.tab0
    tabGroup.addTab tabGroup.tab1

    # Open
    tabGroup.setActiveTab 0
    tabGroup.open()
    return