rem: function IsPropertiesEnabled() 
add: function IsPropertiesEnabled(command) 
context: function IsPropertiesEnabled(){  return IsFolderSelected();}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/ab70c0401d6d07379022c1dd24f9cf977b5d0f95/mail3PaneWindowCommands.js/clean/mailnews/base/resources/content/mail3PaneWindowCommands.js