D10 CTLR WORKING DFW ARR'S EXPERIENCED OPERROR AT 2300 WHEN GPM ARR INITIATED WX MISSED APCH AND CONFLICTED WITH DFW ARR CLRED FOR APCH.

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GRAND PRAIRIE (GPM) LIES UNDERNEATH THE FINALS FOR DFW ARPT 13 MI S. I TOOK A POINTOUT ON THE KING AIR INBOUND TO GPM EXECUTING THE RWY 35 GPS APCH. AS I AND EVERY OTHER CTLR HAS IN THE PAST HAS DONE; AS SOON AS THE KING AIR DSNDED BELOW 2000 FT ON THE APCH I DSNDED THE DFW ARR TO 3000 FT AND CLRED THEM FOR THE ILS RWY 36L APCH. THE KING AIR EXECUTED A MISSED APCH AND STARTED A CLBING L TURN TO 2300 FT. THE OTHER CTLR WORKING THE KING AIR TRIED TO STOP THEM AT 2000 FT BUT THE KING AIR HAD ALREADY CLBED ABOVE THAT ALT. I ISSUED TFC TO THE MD80 AND CANCELED THEIR APCH CLRNC AND THEN REISSUED IT AFTER THEY HAD DIVERGED. AT THE TIME WE WERE RUNNING SIMULTANEOUS ILS APCHS WHICH REQUIRES THE ACFT TO BE ON TWR FREQ. PRIOR TO LOSS OF VERT SEPARATION; THIS FACILITY HAS BEEN WARNED BY SEVERAL WORKGROUPS THAT THIS WOULD HAPPEN AND THEY NEEDED TO DEVELOP A BETTER PROC FOR THIS ARPT. AS WITH EVERYTHING THIS GOES IGNORED UNTIL SOMEONE HAS AN OPERROR. NOW DFW MGMNT SAYS THAT DFW TFC MGMNT COORDINATOR WILL HAVE TO BUILD A GAP IN THE ARR FLOW TO DFW AND DELAY ACR'S FOR AN ARR INTO GPM DURING IFR CONDITIONS. THE MISSED APCH PROC NEEDS TO BE CHANGED TO PROTECT THE DFW FINALS. THIS WAS RECOMMENDED BY THE WORKGROUPS MENTIONED ABOVE BUT STILL HAS NOT BEEN DONE. HOPEFULLY NOW BECAUSE OF MY OPERROR THEY WILL MOVE TO FIX THE PROB.