How to navigate to TabbedPage's child page

I meet a scenario to navigate from MyTabbedPage/ChildTabPage1/Page1 to MyTabbedPage/ChildTabPage2/Page2 in Xamarin.Forms

Right now, I can only switch between MyTabbedPage/ChildTabPage1 and MyTabbedPage/ChildTabPage2. But I need to navigate directly from MyTabbedPage/ChildTabPage1/Page1 to MyTabbedPage/ChildTabPage2/Page2

I also asked question on stackoverflow

How to achieve this? Thank you very much in advance for your helps.