TourDeJewel, Accessing MainContent from the child PlayGround

[choirul anam]

these lines of code is from TourDeJewel example

    <j:ApplicationMainContent localId="main" hasTopAppBar="true"
hasFooterBar="true">

        <local:WelcomeSection name="welcome_panel"/>
        <local:AlertPlayGround name="alert_panel"/>
        <local:ButtonPlayGround name="button_panel"/>
                
        <local:ImagePlayGround name="image_panel"/>
        <local:NumericStepperPlayGround name="numericstepper_panel"/>
                
        <local:ImagePlayGround name="image_panel"/>
        <local:NumericStepperPlayGround name="numericstepper_panel"/>

                etc
                 
        <local:VirtualListsPlayGround name="virtual_lists_panel"/>
        <local:ProgressLoaderPlayGround name="progressloader_panel"/>

    </j:ApplicationMainContent>


How to acces the "main" variable from inside each local component
(ButtonPlayGround, ImagePlayGround etc).

I know in flex we can use some like parentApplication, parentDocument and
FlexGlobal topLevelApplication.
How in royale ?

Thankyou




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