When desiring to use the internal PDF viewer… the only way to select which file to view is in the tabs at the top of the viewer module. There is no way to change the order of the tabs. The only way to browse through the tabs is with the small arrows to the right, which slowly scolls right and left. This is a major inconvienence when there are several files attached to one reference. You have to scroll across, select one, and if you wnat to change, scroll back, and select the other, back and forth. This would be made much easier if the order could be changed. Alternately/additionally, a better method of selecting for the viewer module.