pmdg 747 panel

I have a multi monitor setup using Pmdg 737 having removed the background bmp and repositioned/resized/dragged some switches/instruments etc and all covered with a home made mip panel,all has been good.Now I have tried the same with the Pmdg 747 fs9 and the background bmp won't budge.I also need to remove the background du display frames to allow space to move standby instruments etc so they don't sit on top of the background images and hence flash ,if you get my drift...I assume the pmdg 747 does not allow this like the pmdg 737??I have searched but it is difficult coming up with the right search criteria,any advice from someone who has done similar with the above aircraft would be very welcome.regards Jim