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    <p>For a XAML windows store app, the default look-and-feel of controls is defined in <code>Common/StandardStyles.xaml</code>. If you've ever looked at that file, you'll notice a ton of references like <code>{StaticResource ApplicationForegroundThemeBrush}</code>. Looks promising... </p> <p>Unfortunately, these "theme brushes" aren't defined anywhere in your app, and there's no easy way to set a light or dark override for individual controls. However, there is an answer.</p> <p>Fortunately, <a href="http://metro.excastle.com/xaml-system-brushes" rel="nofollow">there's an excellent blog post by Joe White</a> on the default theme colors, which <a href="https://www.dropbox.com/s/7pkxwgmgekh2v2q/ThemeColors.xml" rel="nofollow">I've turned into a resource dictionary that you can find here</a>. Dropbox only does xml previews so you'll have to rename the file.</p> <p>Copying these resources to your app won't help by itself though. To make use of them, you need to surgically override the default control styles to use them!</p> <p>One way to do this is to create a new resource dictionary, e.g. at <code>Common/CustomStyles.xaml</code>, and merge that into the app's resources like so:</p> <pre><code>&lt;Application x:Class="My.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" RequestedTheme="Light"&gt; &lt;Application.Resources&gt; &lt;ResourceDictionary&gt; &lt;ResourceDictionary.MergedDictionaries&gt; &lt;!-- Styles that define common aspects of the platform look and feel Required by Visual Studio project and item templates --&gt; &lt;ResourceDictionary Source="Common/ThemeColors.xaml"/&gt; &lt;ResourceDictionary Source="Common/StandardStyles.xaml"/&gt; &lt;ResourceDictionary Source="Common/CustomStyles.xaml"/&gt; &lt;/ResourceDictionary.MergedDictionaries&gt; &lt;/ResourceDictionary&gt; &lt;/Application.Resources&gt; &lt;/Application&gt; </code></pre> <p>Notice that our default theme is <code>Light</code>. If we'd like to make a <code>Dark</code>-themed <code>TextBlock</code>, let's copy the visual style from <code>StandardStyles.xaml</code> and add it to our <code>CustomStyles.xaml</code> and make a few changes.</p> <pre><code>&lt;Style x:Key="BasicRichTextStyleDark" TargetType="RichTextBlock"&gt; &lt;Setter Property="Foreground" Value="{StaticResource ApplicationForegroundThemeBrushDark}"/&gt; &lt;Setter Property="FontSize" Value="{StaticResource ControlContentThemeFontSize}"/&gt; &lt;Setter Property="FontFamily" Value="{StaticResource ContentControlThemeFontFamily}"/&gt; &lt;Setter Property="TextTrimming" Value="WordEllipsis"/&gt; &lt;Setter Property="TextWrapping" Value="Wrap"/&gt; &lt;Setter Property="Typography.StylisticSet20" Value="True"/&gt; &lt;Setter Property="Typography.DiscretionaryLigatures" Value="True"/&gt; &lt;Setter Property="Typography.CaseSensitiveForms" Value="True"/&gt; &lt;/Style&gt; </code></pre> <p><strong>Notice that we have appended <code>Dark</code> to the style name and the theme brush definitions!</strong> You can do this via find and replace <code>"ThemeBrush}"</code> => <code>"ThemeBrushDark}"</code> in your CustomStyles.xaml file.</p> <p>Now you can create a dark-themed text block like so:</p> <pre><code>&lt;TextBlock Style="{StaticResource BasicRichTextStyleDark}"/&gt; </code></pre> <p>Of course, you can use this technique for any other type of control as well. A little tedious, but the results are correct and it's not nearly as bad as trying to define every color manually!</p> <p><strong>There's no magic here.</strong> We're just defining some colors and overriding a default style with one that we copy-pasted and modified to use our colors.</p>
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    1. POHow do I mix Light and Dark themes in a C#/XAML Windows Store (Metro UI) App?
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    1. COYour XAML file is fantastic. Saved so much time as I was just about to start on one myself. Everyone should have a copy of this. I don't think people fully understand themes as I've come across many Apps that seem to break when changing from the theme they were developed in. If you are going to start changing default controls then much better to force the app into a theme and use this xaml to create the correct styled controls when you go against the selected theme.
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    2. COThanks Oli, glad it was useful for someone else as well!
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