Apply global style in DateTemplate in silvelight 5

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Silverlight

DataTemplate

style

Hi Please look at this sample.

I have a silverlight project. it has a style file that merged with app.xaml

My global style :

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="TextBlock">
        <Setter Property="FontFamily" Value="Tahoma" />
    </Style>   
</ResourceDictionary>

I Merged it to app.xaml :

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             x:Class="SilverlightApplication1.App"
             >
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Style.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

It has a MainPage :

<UserControl x:Class="SilverlightApplication1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" removed="White">
        <TextBlock Height="23" HorizontalAlignment="Left" Margin="41,51,0,0" Name="textBlock1" Text="ABC" VerticalAlignment="Top" />
        <Button  Height="23" HorizontalAlignment="Left" Margin="41,80,0,0" Name="button1" VerticalAlignment="Top" Width="75" >
            <Button.Template>
                <ControlTemplate>
                    <Border>
                        <TextBlock Text="ABC"  />
                    </Border>
                </ControlTemplate>
            </Button.Template>
        </Button>
       
    </Grid>
</UserControl>

in My MianPage I have a textBlock and a button with Template.
My global style apply on the TextBlock but do not apply on textblock that is
in the DateTemplete for button.

How can I solve this problem that global style apply on the element on DataTemplte ?

Thanls a lot