To apply the Infragistics WPF MetroDark theme to your WPF application, paste the following code into your App.xaml

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Themes/MetroDark/MetroDark.MSControls.Core.Implicit.xaml" />
                <ResourceDictionary Source="Themes/MetroDark/MetroDark.MSControls.Toolkit.Implicit.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>