I think the main way this works is in your element <Application>, you can define styles as resources:
<Application.Resources>
<Style x:Name="MyStyledText" TargetType="TextBlock">
<Setter Property="FontFamily" Value="Segoe WP"/>
<Setter Property="FontSize" Value="24"/>
<Setter Property="Foreground" Value="#123456"/>
</Style>
...
And then, when you want to use it, you can just refer to it as a static resource:
<TextBlock Style="{StaticResource MyStyledText}" ... />
, , :
<phone:PhoneApplicationPage.Resources>
<Style>
...
</Style>
...
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