FK10 FLC ENCOUNTER WHAT WAS ORIGINALLY ADVISED AS A VFR XING C210; BUT LATER TURNED OUT AS AN ACFT BEING CTLED BY ANOTHER CTLR; IN CONFLICT WITH THE FK10.

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CLRED ACFT X TO DSND TO 5000 FT ON RWY 13R LOC; SPD 250 KTS. AT APPROX 9500 FT; ATC ADVISED US OF VFR CESSNA CENTURION TFC CLRED TO 8500 FT; LEVELOFF AT 9000 FT. BEGAN LEVELOFF AT 9000 FT AND ADVISED APCH THAT THE CESSNA ACFT Y WAS CLBING THROUGH 8700 FT APPROX 2 MI AT 12 O'CLOCK POS. APCH INSTRUCTED US TO DSND AND SIMULTANEOUSLY WE GOT A TA/RA THAT COMMANDED A 6000+ FPM RATE OF DSCNT. WE PUSHED THE NOSE OVER AND I RPTED THAT WE WERE RESPONDING TO A TA/RA. I CANNOT SAY FOR CERTAIN HOW CLOSE WE GOT; BUT IT HAD TO BE LESS THAN 1 MI AND LESS THAN 500 FT VERT SEPARATION. THE CTLR WORKING US SAID HE WOULD CALL OVER AND FIND OUT WHO CLRED THE CESSNA THROUGH US. A SIDE NOTE: I GOT A VISUAL ON THE CESSNA AT LESS THAN 2 MI AND HE WAS IN AND OUT OF THE SAME BROKEN LAYER WE WERE IN AT 8500-10000 FT; SO HE SHOULD AT LEAST HAVE TO EXPLAIN HOW HE MAINTAINED VFR. CRISIS OVER -- OR SO WE THOUGHT -- A FREQ CHANGE TO 118.42; I BELIEVE; AND THIS GUY SLOWS US FROM APPROX 250 KTS TO 170 KTS TO 150 KTS IN RAPID SUCCESSION TO FIT AN ATR ABOUT 3 MI IN FRONT OF US; BRIEFING THE ACFT FULLY AND NOT SAYING A WORD TO US UNTIL I ASKED; EVEN THOUGH WE WERE OVERTAKING THE ATR RAPIDLY. AT LEAST WE SAW THE ATR A LITTLE IN ADVANCE AND KNEW THAT THE SPD REDUCTION NEEDED TO BE A QUICK ONE. I OVERLOOKED A COUPLE OF OTHER SIMILAR OCCURRENCES IN THE PAST COUPLE OF MONTHS; BUT THIS WAS WAY TOO CLOSE AND I THINK I SEE A DANGEROUS TREND DEVELOPING AT DFW. SUPPLEMENTAL INFO FROM ACN 448422: APCH INFORMED US OF VFR TFC AT 12 O'CLOCK AT 8500 FT. THERE WERE CLOUDS AT 9000 FT. APPARENTLY THE VFR TFC WAS GETTING ADVISORIES ON ANOTHER FREQ AND THE CTLR DID INDICATE HE WAS GOING TO ASK WHY THE VFR TFC WAS IN A CLB. WE WERE ONLY ABOUT 1 MI FROM TFC AT SAME ALT.