back button in master detail page xamarin forms prism - xamarin

Im using prism with my xamarin forms application. i use master detail with the exact structure that you used but when i change detail page my back button wont work and when i click on back button in android it just close the app. and also the back button in toolbar wont show either. how can i fix this?
this picture belongs to time that i've changed the detail page that you can see there is no back button there
Version with issue: 7.0.0.396
Xamarin.Forms version: 3.0.0.482510
IDE: VS 15.7.1
enter image description here

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