wp8 pivot prob

gistfile1.xml

<phone:PhoneApplicationPage 
    x:Class="Premise.View.Cameras"
    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="Landscape"  
    Orientation="Landscape"
    shell:SystemTray.IsVisible="True" 
    DataContext="{Binding CamerasViewModel, Source={StaticResource Locator}}" 
    >
    <!--LayoutRoot is the root grid where all page content is placed-->
    <phone:PhoneApplicationPage.Resources>
        <Style x:Key="emptyPivot" TargetType="phone:Pivot">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="phone:Pivot">
                        <Grid HorizontalAlignment="{TemplateBinding HorizontalAlignment}" 
                              VerticalAlignment="{TemplateBinding VerticalAlignment}">
                            <ItemsPresenter x:Name="PivotItemPresenter" Margin="{TemplateBinding Padding}" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="CamerasItemStyle" TargetType="phone:PivotItem">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="phone:PivotItem">
                        <Image Source="{Binding JpgUrl}"/>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </phone:PhoneApplicationPage.Resources>
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <!--Pivot Control-->
        <phone:Pivot Title="Cameras"
            ItemsSource="{Binding Cameras}" 
            Style="{StaticResource emptyPivot}" 
            ItemContainerStyle="{StaticResource CamerasItemStyle}" Tap="Pivot_Tap">
        </phone:Pivot>

        <ProgressBar
            Visibility="{Binding IsLoading, Converter={StaticResource VisibilityConverter}}"
                IsIndeterminate="{Binding IsLoading}"
                VerticalAlignment="Center"
                Style="{StaticResource PerformanceProgressBar}" />
        <TextBlock 
            Visibility="{Binding IsLoading, Converter={StaticResource VisibilityConverter}}"
            Style="{StaticResource PhoneTextNormalStyle}"
            VerticalAlignment="Center"
            HorizontalAlignment="Center"
            Text="Refreshing camera images..."
            Margin="0,42,0,0"/>
        <TextBlock 
            Style="{StaticResource PhoneTextNormalStyle}"
            VerticalAlignment="Center"
            HorizontalAlignment="Center"
            Text="{Binding ErrorText}"
            Margin="0,42,0,0"/>
    </Grid>
</phone:PhoneApplicationPage>