BE58 PLT WAS MOVING SWITCHES DURING HIGH SPD LNDG ROLL. THE GEAR NOSEWHEEL RETRACTED SIMULTANEOUSLY WITH TURNING THE XPONDER OFF.

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HAVING BEEN CLRED FOR APCH TO RWY 1 AT UKF ILS; I EXECUTED THE FULL APCH. AFTER MY PROC TURN INBOUND; I TRACKED THE LOC INBOUND AND INTERCEPTED THE GS. I PUT MY GEAR DOWN AND GOT THE 3 GREEN LIGHTS TO INDICATE THE GEAR WAS DOWN AND LOCKED. I BROKE OUT OF THE CLOUD SAT ABOUT 2500 FT MSL. I THEN PROCEEDED TO LAND. I TOUCHED DOWN; HEARD THE WHEELS TOUCH. I THEN REACHED OVER TO TURN MY XPONDER OFF. AT THAT POINT A WARNING HORN WENT OFF. SECONDS LATER; THE NOSE OF THE ACFT SEEMED TO DROP AND I WAS SLIDING DOWN THE RWY ON THE BELLY. AS THE ACFT WAS SLOWING; SMOKE FILLED THE COCKPIT. I OPENED THE DOOR; SWITCHED OFF THE FUEL; THE ELECTRICS; AND LEFT THE ACFT AS QUICK AS I COULD. THE ACFT DID NOT CATCH FIRE. I SPOKE WITH THE COURIER I WAS TO MEET. HE SAID HE HEARD MY WHEELS TOUCH AND THEN A CRASH. MY APCH SPD WAS 130 KIAS. I HAD APCH FLAPS 15 DEGS SET. THE ONLY DAMAGE TO THE ACFT WAS THE PROPS AND THE MAIN GEAR DOORS. I WAS ON THE ILS UNDER ATL APCH CTL UNTIL WILKI NDB. WHEN I WENT VISUAL; I CANCELED IFR.