A CHARTER FLC FLYING GIV ON VECTORS TO INTERCEPT THE LOC AT BJC FAILS TO MAINTAIN ALT AS ASSIGNED BY ATC.

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WHILE BEING VECTORED FOR ILS RWY 29R APCH TO BJC; CTLR ASSIGNED 7000 FT. THE COMMERCIAL CHART PAGE SHOWS 7200 FT AS THE APCH PROC AND GS INTERCEPT ALT. AS WE WERE TURNED TOWARDS THE LOC COURSE; THE CTLR REASSIGNED THE ALT AS 7200 FT. AS PNF; I RESET THE FGP ALT SELECTOR TO 7200 FT AND VERBALLY CONFIRMED WITH THE CAPT. THE CAPT DID NOT IMMEDIATELY RESPOND OR ACKNOWLEDGE THE NEW ALT. I RESTATED TO HIM THE REVISED ALT WHILE POINTING TO THE ALT SELECTOR ON THE FGP. WE WERE AT THAT TIME APCHING THE TURN TO INTERCEPT THE LOC COURSE. THE CAPT REACHED FOR THE FGP; AND I ASSUMED THAT HE WOULD USE IT TO MAKE THE ALT CORRECTION. I DIVERTED MY ATTN DOWN TO TUNE THE TWR FREQ ON THE COMS. AS I COMPLETED THIS TASK AND RETURNED FOCUS TO THE FLT INSTS; THE APCH CTLR CALLED SAYING WE WERE SHOWING 6800 FT -- 400 FT BELOW OUR ASSIGNED ALT. I OBSERVED THAT WE WERE OUT OF 6900 FT AND CLBING SLIGHTLY. I RESPONDED THAT WE WERE OUT OF 7000 FT FOR 7200 FT (AS WE WERE BY THEN). WE LEVELED AT 7200 FT. THE CTLR ASKED FOR OUR HOME BASE; THEN RELEASED US TO TWR. THE BAL OF THE APCH AND LNDG WAS UNEVENTFUL. I BELIEVE THAT THE CAPT FELT WE WERE CLOSE ENOUGH TO THE APCH COURSE THAT BY THE TIME HE COULD CLB TO 7200 FT; WE WOULD INTERCEPT THE GS; AND SO MAY HAVE NOT RESPONDED. I DO NOT KNOW. I DISLIKE FLYING WITH THIS CAPT BECAUSE OF MY UNCERTAINTY ABOUT THIS PROC AND HIS ABILITY TO ABSORB AND REACT TO CHANGING SITS. MY ATTEMPTS TO DISCUSS THIS EVENT WITH HIM WERE REBUFFED. INDEED ALL ATTEMPTS AT RATIONAL DISCUSSION AND DEBATE WITH HIM LEAD ONLY TO FRUSTRATION. THIS EVENT HAS BROUGHT ME TO THE POINT OF CONCERN THAT I MUST NOW BRING THIS TO THE ATTN OF THE DIRECTOR OF OPS.