title: Ribbon change the Headers text Color
body: <p>I am stuck with a little problem: The background Color of my Ribbon clashes badly with the default color of the RibbonGroups.
  I am unable to change the color to something more readable, like plain black. I tried to set the TextBlock.Foreground Property and that changes the appearance in VS 2012, but not when the program is running.</p>
  
  <p>The XAML is very straightforward:
  I am using the stock Ribbon, no third party Controls.
        
           
                      
                  </p>
  
  <pre><code>            &lt;RibbonTab x:Name="RTabPowerPoint" Header="Powerpoint"&gt;
                  &lt;RibbonGroup Header="Allgemeines"&gt;
                      &lt;RibbonButton x:Name="cmdLoadPowerPoint" SmallImageSource="/Images/powerpoint-26.png" LargeImageSource="/Images/powerpoint-32.png" Label="Lade Datei"/&gt;
                      &lt;RibbonButton x:Name="CmdLoadBPZ" SmallImageSource="/Images/open_in_browser-26.png" LargeImageSource="/Images/open_in_browser-32.png" Label="Lade Vorlage"/&gt;
                      &lt;RibbonButton x:Name="cmdSaveOpenFiles" SmallImageSource="/Images/save-26.png" LargeImageSource="/Images/save-32.png" Label="Speichere Vorlage"/&gt;
                      &lt;RibbonButton x:Name="cmdChangeFiledestinationPowerPoint" SmallImageSource="/Images/sinchronize-26.png" LargeImageSource="/Images/sinchronize-32.png" Label="BLA"/&gt;
                  &lt;/RibbonGroup&gt;
            &lt;/RibbonTab&gt;
          &lt;/Ribbon&gt;
  </code></pre>