If you have overlapping frames in your document, Calamus will keep
track of which frame is on top of which: The oldest frame will be at
the bottom, and the most recent at the top. Imagine the frames simply
as pieces of overhead transparency foil, which where they overlap lie
at several levels atop each other. This becomes especially clear for
raster area frames, which are not made of transparency foil but are
normally displayed with fully covering contents that hide everything
under them. The Frame to background
function allows you to
select a frame and move it to the bottom of the pile. If you want to
select a frame which is not currently at the top, keep clicking the
mouse on the same spot, and Calamus will eventually select it.
