title: How to access a XAML Resource from a CustomControl.cs C# file?
body: <p>I have a XXXCustomControl.cs class and inside the c# class I want to access via</p>
  
  <pre><code>groupStyle.ContainerStyle = this.FindResource("GroupHeaderStyle") as Style;
  </code></pre>
  
  <p>the GroupHeaderStyle, but this style is defined somewhere else (wherever that is...)</p>
  
  <p>Now my question: What is the best place to put my GroupHeaderStyle and how to get it via </p>
  
  <p>FindResource from c# code?</p>