XPLMUnregisterCommandHandler

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XPLM_API void       XPLMUnregisterCommandHandler(
                         XPLMCommandRef       inComand,    
                         XPLMCommandCallback_f inHandler,    
                         int                  inBefore,    
                         void *               inRefcon);

XPLMUnregisterCommandHandler removes a command callback registered with XPLMRegisterCommandHandler.