FA50 FLT CREW; ON FINAL APCH TO RWY 17L AT DFW; LISTENED TO THEIR BOSS INSTEAD OF LCL AND BROKE OFF THE ILS WITHOUT PERMISSION.

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PROB AROSE WHEN OUR BOSS DECIDED HE DID NOT WANT TO LAND AT DFW. HIS PLANS CHANGED AND HE FAILED TO INFORM US UNTIL ON SHORT FINAL AT DFW; RWY 17L. WE ASKED THE TWR IF WE COULD GET A CLRNC TO BMQ BECAUSE OUR BOSS HAD CHANGED HIS PLANS. I TOLD HER WE HAD A FLT PLAN ON FILE. WE WERE TOLD TO CONTINUE. WE SHALLOWED OUR DSCNT IN EXPECTATION OF A CLRNC OUT OF THE AIRSPACE. I TOLD THE TWR A FEW SECONDS LATER THAT WE WOULD LIKE TO OVERFLY THE ARPT. THE TWR THEN SAID SHE WOULD LIKE FOR US TO LAND IF WE COULD. WE WERE TOO HIGH AT THIS TIME AND TOLD HER WE COULD NOT LAND; BUT TO SEND US IN ANY DIRECTION TO GET OUT OF HER TFC. LOOKING BACK; WE SHOULD HAVE STAYED ON THE GS AND CONTINUED TO LAND UNTIL WE WERE CLRED ON OR NOT. I PERCEIVED IT WOULD BE OK TO CONTINUE IN A MISSED APCH. I REALLY THINK THE TWR CTLR WAS TRYING TO BE HELPFUL AND GAVE THE FEELING IT WAS OK TO CONTINUE ON A GAR. WE WERE GIVEN THE NUMBER TO CALL AND DID SO ON RETURN TO HOME BASE. WE GAVE THE INFO TO THE TWR; AS SOON AS WE KNEW OF THE NEED FOR THE CHANGE OF PLANS. WE WOULD HAVE BEEN GLAD TO LAND IF WE FELT THAT IS WHAT WAS NEEDED. IT IS OBVIOUS; THE NEXT TIME; WE WILL BE LNDG. SUPPLEMENTAL INFO FROM ACN 625502: WE WERE ON A VISUAL APCH TO RWY 17L AT DFW. ALL WAS NORMAL UNTIL THE BOSS RUNS IN THE COCKPIT AND SAYS 'I'M SORRY BUT I FORGOT TO TELL YOU WE DON'T NEED TO LAND AT DFW.' ALL WORKED WELL FOR US BUT THERE MUST HAVE BEEN A LOT OF CONFUSION IN THE TWR. AT ONE POINT THE TWR ASKED IF WE COULD LAND BUT WE WERE TOO CLOSE AND TOO HIGH FOR A NORMAL LNDG. ON DEP WE WERE GIVEN A PHONE NUMBER AND ADVISED THAT IT WAS A BAD WAY TO OPERATE. IT MUST HAVE CAUSED SOME CONCERN IN THE TWR BUT; FOR US; IT WAS NO MORE THAN A 'MISSED APCH' OR 'GAR.' I DON'T BELIEVE ANY FAR'S WERE BROKEN. I THINK; IN HINDSIGHT; WE SHOULD HAVE LANDED; AND NOT LET THE PAX'S PROBS BECOME A PROB FOR THE CREW OR ATC.