Adds a menu command to the list of commands that are always displayed when a user opens a menu.
A basic command is always displayed when the menu is opened. This method is meaningful when the user chooses to view recently used commands.
Use the CMFCToolBar::SetBasicCommands method to set the list of commands that are always displayed when a user opens a menu. Use the CMFCToolBar::GetBasicCommands method to retrieve the list of basic commands that is used by your application.