Top and Bottombar navigation in xamarin form

HI guys, Thiyraash here. I need to do bottom and top navigation bar/ tabbed on the same page and I managed to achieved it. I did the bottom tabbed bar using BottomNavigationBarXF [https://github.com/thrive-now/BottomNavigationBarXF] . The bottom tabbed bar act as Mainpage(A) for my app. Inside the bottomtabbedbarpage I have another TopTabbedpage(B) where I got three children tabbed(B1,B2,B3) which each navigate to different content pages. What I like to achieved is when I press a button in content page B1, I want the it to popup new whole page above TopTabbedpage(B) instead of inside the TopTabbedpage(B). How can I achieve the desired result? Can you give me some hint on how to achieve. I do get to know something called Segmentedbar [https://xamboy.com/2018/01/12/segmented-bar-control-in-xamarin-forms/] but I just want to know is there any other way to do it. Below the related code and the picture of my app page,

Code for Mainpage(A)

Code for TopTabbedpage(B) -(CoursesPage)

My page