I cannot delete the navigation bar at bottom of the screen

Hi I am using Xamarin Forms - Content Page to show a list of items. When I test on Android 4.x the list shows it items correctly until the bottom of the screen. But when I test on Android 5.x appears a bottom bar. I've tried to hide that using this code NavigationPage.SetHasNavigationBar (this, false); but this make the navigation bar (top and bottom) invisible. I only want to hide the bottom bar. Also I've tried to use this code in the Activity: this.Window.AddFlags(global::Android.Views.WindowManagerFlags.Fullscreen); but this code only make a slightly smaller the bottom bar. Is there a way to hide this part? - you can see the attached image