Answer for SO question

App.xaml

<Application
    x:Class="Approve.App"
    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:local="clr-namespace:Approve">
 
    <!--Application Resources-->
   
    <Application.Resources>
        
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Style.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
 
         <local:LocalizedStrings  x:Key="LocalizedStrings"/>
    </Application.Resources>
 
    <Application.ApplicationLifetimeObjects>
        <!--Required object that handles lifetime events for the application-->
        <shell:PhoneApplicationService
            Launching="Application_Launching" Closing="Application_Closing"
            Activated="Application_Activated" Deactivated="Application_Deactivated"/>
    </Application.ApplicationLifetimeObjects>  
</Application>

Style.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:sys="clr-namespace:System;assembly=mscorlib">
    <sys:Double x:Key="PanoramaItemHeaderFontSize">66</sys:Double>
    
    <Style x:Key="PanoramaItemHeaderTextStyle" TargetType="TextBlock">
            <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilySemiLight}"/>
            <Setter Property="FontSize" Value="{StaticResource PanoramaItemHeaderFontSize}"/>
            <Setter Property="CharacterSpacing" Value="-35"/>
    </Style>
        
    <Color x:Key="MainBackGroundColor">#F6F5E0</Color>
</ResourceDictionary>