title: ResourceDictionary and Styles not merging across application
body: <p>I have an application that uses a ResourceDictionary  to set the styles, which it does nicely. However, the font is a little small and I would like to change that but the resource directory is from a .dll so I can't edit it.</p>
  
  <p>As you will notice I'm just starting out with dictionaries.</p>
  
  <p>I thought I could override this by using MergedDictionaries and just add a style to override it:</p>
  
  <pre><code>&lt;Application x:Class="IDIUserInterface.App"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  StartupUri="Windows/WindowMain.xaml" &gt;
  &lt;Application.Resources&gt;
  
      &lt;ResourceDictionary&gt;
          &lt;ResourceDictionary.MergedDictionaries&gt;
              &lt;ResourceDictionary  Source="/ReuxablesLegacy;component/mercury.xaml" /&gt;
          &lt;/ResourceDictionary.MergedDictionaries&gt;
          &lt;Style TargetType="Window"&gt;
              &lt;Setter Property="FontSize" Value="12" /&gt;
              &lt;Setter Property="FontFamily" Value="Arial" /&gt;
          &lt;/Style&gt;
          &lt;Style TargetType="Page"&gt;
              &lt;Setter Property="FontSize" Value="12" /&gt;
              &lt;Setter Property="FontFamily" Value="Arial" /&gt;
          &lt;/Style&gt;
      &lt;/ResourceDictionary&gt;
  
  &lt;/Application.Resources&gt;
  </code></pre>
  
  <p></p>
  
  <p>To my shock this actually worked, but only in the design view. As soon as I compiled the code and ran the application the fonts return to their former size.</p>
  
  <p>Is there a reason for this or am I doing something wrong?</p>
  
  <p>Thanks in advance,
  SumGuy</p>