is dropdown allows you to select a particular runtime framework to be used
   for loading and running tests under the current configuration. Currently,
   only Microsoft .NET and Mono are supported. If <b>Any</b> is selected, the
   tests will be run under the same runtime that NUnit itself is currently using.

<h4>Version</h4>
<p>This ComboBox allows you to select the particular version of the runtime framework
   to be used for loading and running tests under the current configuration. The
   dropdown lis