code = GetCode( imsg )
UWORD GetCode( struct IntuiMessage * )
Returns the true IntuiMessage code field. Layout.gadget replaces the IDCMP_GADGETUP message with an IDCMP_IDCMPUPDATE. This function will return the "gadgetup code" from the IDCMPUPDATE taglist if it is found there, and otherwise the normal imsg->Code.