A BE1900 FLC TAXIES PAST THE INTXN THAT THEY WERE CLRED TO; ENTERING AN UNOCCUPIED RWY IN THE PROCESS AT MKE; WI.

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FLT XXX TAXIING FROM GATE X TO RWY 19R AT TXWY V; VIA TXWYS B; M; E. COMPLETED APPROPRIATE CHKLIST AND XFERRED CTLS TO FO TO TAXI. FO DID NOT STOP AT TXWY V BUT CONTINUED TO AND ONTO RWY 25R. RWY WAS NOT IN USE. WE DID HOWEVER HOLD SHORT OF ILS CRITICAL AREA FOR RWY 19R. AND WE HELD SHORT OF RWY 19R ON RWY 25R. MILWAUKEE GND INSTRUCTS ALL ACFT WHEN TO SWITCH TO TWR FREQ. GND CTL SWITCHED US BEFORE WE REACHED TXWY V. AS I WAS SWITCHING FREQS THE FO TAXIED BEYOND TXWY V AND CONTINUED ON TXWY E. BY THE TIME I REALIZED WHAT WAS HAPPENING; WE WERE ON RWY 25R. IT WAS MY FIRST FLT IN OVER 2 WKS AND I FELT RUSHED AND OUT OF THE LOOP. MY FO WAS NOT A NEW-HIRE AND HAS BEEN WITH THE COMPANY FOR OVER A YR. I WAS PROBABLY A LITTLE TOO RELAXED IN MONITORING OUR PROGRESS ALONG THE TXWY DUE TO THE FACT I KNEW I HAD A SEASONED; GOOD FO. MILWAUKEE TWR WAS BUSY WITH INCOMING TFC LNDG AND DID NOT NOTICE US PASSING TXWY V UNTIL IT WAS TOO LATE. MILWAUKEE GND HANDED US OVER TOO EARLY TO A BUSY; PREOCCUPIED MILWAUKEE TWR.