BindingExpression path error when binding PickerBox ItemsSource to a collection with 20 or more items and using FullModeDisplayMemberPath

[P2SH]

Enter full mode and scroll, these outputs are shown:

System.Windows.Data Error: BindingExpression path error: 'Key' property not found on 'System.Collections.Generic.List`1[System.Object]' 'System.Collections.Generic.List`1[System.Object]' (HashCode=66629291). BindingExpression: Path='Key' DataItem='System.Collections.Generic.List`1[System.Object]' (HashCode=66629291); target element is 'Microsoft.Phone.Controls.Primitives.PickerBoxListItem' (Name=''); target property is 'Content' (type 'System.Object')..
System.Windows.Data Error: BindingExpression path error: 'Property1' property not found on 'System.Collections.Generic.List`1[System.Object]' 'System.Collections.Generic.List`1[System.Object]' (HashCode=43330072). BindingExpression: Path='Property1' DataItem='System.Collections.Generic.List`1[System.Object]' (HashCode=43330072); target element is 'Microsoft.Phone.Controls.Primitives.PickerBoxListItem' (Name=''); target property is 'Content' (type 'System.Object')..

Items are displayed correctly though. No error is shown when the collection has less than 20 items.

XAML

<phone:PhoneApplicationPage
    x:Class="PhoneApp1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True"
    xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
    DataContext="{Binding RelativeSource={RelativeSource Self}}">

    <StackPanel>
        <toolkit:PickerBox ItemsSource="{Binding DictSrc}" FullModeDisplayMemberPath="Key"/>
        <toolkit:PickerBox ItemsSource="{Binding ListSrc}" FullModeDisplayMemberPath="Property1"/>
    </StackPanel>
</phone:PhoneApplicationPage>

C#

using System.Collections.Generic;
using Microsoft.Phone.Controls;

namespace PhoneApp1
{
    public partial class MainPage : PhoneApplicationPage
    {
        Dictionary<string, string> dictSrc = new Dictionary<string, string>
        {
            {"0", ""}, {"1", ""}, {"2", ""}, {"3", ""}, {"4", ""},
            {"5", ""}, {"6", ""}, {"7", ""}, {"8", ""}, {"9", ""},
            {"10", ""}, {"11", ""}, {"12", ""}, {"13", ""}, {"14", ""},
            {"15", ""}, {"16", ""}, {"17", ""}, {"18", ""}, {"19", ""}
        };

        public Dictionary<string, string> DictSrc { get { return dictSrc; } }

        List<ListItem> listSrc = new List<ListItem>
        {
            new ListItem("0", ""), new ListItem("1", ""), new ListItem("2", ""), new ListItem("3", ""), new ListItem("4", ""),
            new ListItem("5", ""), new ListItem("6", ""), new ListItem("7", ""), new ListItem("8", ""), new ListItem("9", ""),
            new ListItem("10", ""), new ListItem("11", ""), new ListItem("12", ""), new ListItem("13", ""), new ListItem("14", ""),
            new ListItem("15", ""), new ListItem("16", ""), new ListItem("17", ""), new ListItem("18", ""), new ListItem("19", ""),
        };

        public List<ListItem> ListSrc { get { return listSrc; } }

        public MainPage()
        {
            InitializeComponent();
        }
    }

    public class ListItem
    {
        public string Property1 { get; set; }
        public string Property2 { get; set; }

        public ListItem(string prop1, string prop2)
        {
            Property1 = prop1;
            Property2 = prop2;
        }
    }
}

[Kinnara]

Should be fixed now. Thank you for reporting!