public void OnSoftkeyServiceVisibleEvent(object sender, Shell.SoftkeyVisibleState state)
 {
     Shell.SoftkeyService obj = (Shell.SoftkeyService)sender;
     textSoftkeyServiceVisible.Text = $"Visible: {state}";
     if (state == Shell.SoftkeyVisibleState.Shown)
     {
         obj.Show();
     }
     else
     {
         obj.Hide();
     }
 }
 private void BtnSoftkeyServiceShow_ClickEvent(object sender, Button.ClickEventArgs e)
 {
     softkeyService.Show();
 }