Issue Description

If two pages have a RootLayout element, then after backward navigation from the second page to the first page, an error will occur when trying to access the RootLayout (e.g. call getRootLayout()).
This is because RootLayout class called on the second page overwrites the global variable:

global.rootLayout = this;

So RootLayout of the first page "becomes" undefined.

Workaround (code for the first page):

export function navigatedTo(data: NavigatedData) {
  const page = <Page>data.object;
  if (data.isBackNavigation) {
    global.rootLayout = <RootLayout>page.getViewById('firstPageRootLayout');
  }
}

Reproduction

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Relevant log output (if applicable)

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Environment

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• I have searched the existing issues as well as StackOverflow and this has not been posted before
• This is a bug report
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