private async void TapGestureRecognizer_Tapped(object sender, EventArgs e)
        {
            if (!BottomStack.IsVisible)
            {
                headerImage.Source = "droparrow.png";

                BottomStack.IsVisible = true;
                await BottomStack.TranslateTo(0, 0, 250);
            }
            else
            {
                headerImage.Source = "droparrow.png";

                BottomStack.IsVisible = false;
                await BottomStack.TranslateTo(0, -10, 250);
            }
        }