Call System::AutoCmd::Clear to remove the System::AutoCmd::AutoCmd object’s association with an Automation interface method. System::AutoCmd::Clear replaces the method name with an empty string, and frees all arguments that have been assigned. After a call to System::AutoCmd::Clear, the System::AutoCmd::AutoCmd object can’t be executed until a new method name is assigned (using SetName) and, if necessary, new parameters assigned (using the << operator). 

System::AutoCmd::ClearName 

System::AutoCmd::ClearArgs