using dual monitors

Ok here is the problem. when i was running xp and flying the 737-700I aways used to put the overhead panel on my left monitor and fly on my right monitor. i made sure that dual monitors were checked in the pmdg options section. then all i had to do was bring up the overhead panel right click select it then drag it to my left monitor were it would adjust itself to the monitor size and everything would be fine.but now im using windows vista and flying the 747-400x i went through everystep as before but when i right click i do not get an option to grab it and bring it over. if i do just take the whole screen and bring it over it does not fit the monitor and a quarter of my overhead cannot be seen. Am i missing something???Thank youSteve