Unable to set badge in ToolbarItems with tabbed page in Xamarin forms

I want to display badge counter above the icon in ToolbarItem for Xamarin forms application. In my application I am using bottom tab and top tabbed page.

         <Controls:ExtendedTabbedPage.ToolbarItems >
                  <ToolbarItem  Icon="cart" Command="{Binding ToolbarItemCommand}" />
                </Controls:ExtendedTabbedPage.ToolbarItems>
        <Controls:ExtendedTabbedPage.Children>
                    <NavigationPage x:Name="HomePage" Title="CHILDREN" IconImageSource="child_tab_orange.png" BarBackgroundColor="#F88720" BarTextColor="White">
                        <x:Arguments>
                            <local:HomePage /> <!--Content page-->
                        </x:Arguments>
                    </NavigationPage>
                    <NavigationPage x:Name="ConnectTab" Title="CONNECT" IconImageSource="connect_tab_blue.png" BarBackgroundColor="#F88720" BarTextColor="White">
                        <x:Arguments>
                            <local1:ConnectTabPage /> <!--Tabbed page with 3 content page-->
                        </x:Arguments>
                    </NavigationPage>
         </Controls:ExtendedTabbedPage.Children>
         ....

I am not able to find RightBarButtonItems for the ConnectTabPage page where ConnectTabPage is top tabbed page with 3 content page.

var rightButtonItems = vc?.ParentViewController?.NavigationItem?.RightBarButtonItems;

rightButtonItems returns null for ConnectTabPage but it's working for HomePage

Anyone having an idea of this issue?