Revert "Controller.show_attrbute: Use #call, not #send."
Revert "Controller.show_attrbute: Use #call, not #send."

This reverts commit 7cdfa8cd371babac4d31597bf1ebdadf0fe1e38d.

It appears that #send was, indeed, the proper method to be using.

frc-frecon/frecon,frc-frecon/frecon