Unable to use the cyclic assembler

[SmurfyDoess]

Hey hey, I've gotten into thermal expansion and am starting to automate everything, however I'm having trouble using the cyclic assembler.. I can build it, put in a schematic and stuff in the slots, yet it won't let me actually 'draw' anything in the schematic dropdown thingy (the blue bit on the right hand side) I've tried left, right and middle clicking, shifting, everything, I can't figure it out. Does anyone have a solution or is having the same problem?

[darkphan]

You have to create the schematic on a machinists workbench before you put it in the cyclic assembler.