ILRepack.IntegrationTests/Scenarios/ClassLibrary/ButtonStyles.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style x:Key="PredefinedButtonContentStyle" TargetType="{x:Type Button}">
        <Setter Property="Content" Value="Text set from a style" />
    </Style>
</ResourceDictionary>