Working on Layers

Hello,  I am a complete newbie to CorelDraw.  I am attempting to trace a blueprint, I have scanned it in and scaled it on the first layer.  I created a new layer and began drawing lines.  I can't seem to edit the lines in shape mode.  I tried to hiding the first layer but that does not work either.  I've practiced drawing shapes and lines on a blank canvas and I do not have any problems editing in shape mode, so I am assuming that I am not using the layers right.

Thanks