code: public WTab getActiveTab() {
  		List<WTab> activeTabs = getActiveTabs();
  
  		return activeTabs.isEmpty() ? null : activeTabs.get(0);
  	}
docs: Returns the active tab (as seen by the given context/session). Note that some tab sets support multiple active
  tabs, see {@link #getActiveTabs()}.
  
  @return the active tab (as seen by the given context/session).