Binding ListView on Windows Phone 8 don't work

Hello I have the following XAML:

 <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="BNBApp.Productos.frmExtracto"
              xmlns:local="clr-namespace:BNBApp;assembly=BNBApp"
              Title="Extract">
   <StackLayout>
     <Label Text="Choose an Account"/>
     <Picker x:Name="pckCuentas" Title="Choose an Account" ></Picker>
     <StackLayout>
       <ListView x:Name="lsvMovimientos" HasUnevenRows="True">
         <ListView.ItemTemplate>
           <DataTemplate>
             <ViewCell>
               <Frame HasShadow="True" OutlineColor="Silver">
                 <StackLayout>
                   <Label Text="{Binding Descripcion}"></Label>
                   <StackLayout Orientation="Horizontal">
                     <Label Text="01/01/2015"></Label>
                     <Label Text="12:59:21"></Label>
                     <Label Text="One"></Label>
                     <Label Text="Two"></Label>
                   </StackLayout>
                 </StackLayout>
               </Frame>
             </ViewCell>
           </DataTemplate>
         </ListView.ItemTemplate>
       </ListView>
     </StackLayout>
   </StackLayout>
 </ContentPage>

I tried it on an Android device and works perfectly. When I test Windows Phone (device or emulator) above shows only the FRAME and all inside empty.

The code with which fill it is:

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

namespace BNBApp.Productos
{
  public partial class frmExtracto : ContentPage
  {
    public class TipoMovimiento
    {
      public string Descripcion { get; set; }
    }

    public static List<TipoMovimiento> Movimientos = new List<TipoMovimiento>();

    public frmExtracto()
    {
      InitializeComponent();
      for (int i = 0; i < 30; i++)
      {
        Movimientos.Add(new TipoMovimiento { Descripcion = "Debit Transaction " + i.ToString() });
      }
      lsvMovimientos.IsPullToRefreshEnabled = false;
      lsvMovimientos.ItemsSource = Movimientos;
    }
  }
}

I think the problem is the NAMESPACE for some reason can't bind, but I don't know how to fix this.

Could someone help me.