Example of Sliding Panel in Xamarin.Forms applications - http://julianocustodio.com/sliding-panel

MainPageDown.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace DemoSlidingPanel
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();

            PageDown.TranslationY = 1000;
        }

        async void UpBlue_Tapped(object sender, System.EventArgs e)
        {
            await PageDown.TranslateTo(0, 0, 500, Easing.SinIn);
        }

        async void DownWhite_Tapped(object sender, System.EventArgs e)
        {
            await PageDown.TranslateTo(0, Page.Height, 500, Easing.SinIn);
        }       

    }
}