title: Binding a Checkbox to a String
body: <p>I've got a question about the binding of checkboxes.
  Is it possible to bind a WPF checkbox to a string
  with "true" or "false". 
  I don't want to use the boolean variable in binding</p>
  
  <pre><code>&lt;CheckBox x:Name="myCheckBox" IsChecked="{Binding someBooleanVariable}"/&gt;
  </code></pre>
  
  <p>I want to to do something like</p>
  
  <pre><code>&lt;CheckBox x:Name="myCheckBox" IsChecked="{Binding someStringVariable}"/&gt;
  </code></pre>
  
  <p>I need that because I want to bind a part of my UI to a Hashmap containing strings. But the UI consists of Textboxes, Checkboxes and Radiobuttons. I want to bind my UI Elements to a function with a parameter for the key of the hashmap. And the function shall return the value of the given key as a string.</p>