TabbedPage

Hello,

I change recently my App.cs to have a NavigationPage:

public static Page GetMainPage()
        {
            return new NavigationPage(new HomePage());
        }

My HomePage is a TabbedPage
Since there are only titles of the tab who are displayed.
If I click on the last and I come back on other tab the content of all tab is finally displayed.

Do you have an idea why is not working? I precise my tabbed worked fine before the change of App.cs