Plugins analysis.
The MethodPlugins is actually not a real method, but it is just a wrapper to call the TPluginsManager of ROOT and find a external method which can be used to extend TMVA by another classifier. The only methods which are actually really implemented are the constructors which fulfill the plugins handling. The others will produce FATAL warnings and stop TMVA execution.
Right after the constructor, the additional method 'getPlugedinMethod()' is called, which returns the method loaded by the plugin manager, and the MethodPlugins object is already deleted.