Nonvirtual member functions

• int addcommand(Command *) - adds the given Command instance to the end of the command queue. Returns success.
• int runcommand(Command *) - have the command queue execute the given command immediately. Returns the success of the command, or -1 if the command was queued for later execution.
• void command_wanted(int) - sets the proper flag in the doCmd array to indicate that the given command code is a command the UIObject is interested in.
• void command_not_wanted(int) - opposite of command_wanted.
• int id(void) - return the ID of this UIObject.
• int want_command(int) - return whether the given command is one this object is interested in.