<Page.Resources>
    <ResourceDictionary>
        <Style TargetType="Grid" x:Key="GridAnimation"> </Style>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="/ResourceDictionaries/AuthenticationDictionary.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Page.Resources>