I don't know if it is possible, but what I'd like to do is use a YES/NO parameter to set the hidden status of a layer/curve/sketch. Can layers be controlled using 'IF' statements to check a parameter?I want my pro-program to pull in a yes/no value; and depending on that value that the parameter is set to, I want the hidden status of a layer/curve/sketch to change. Does anyone have any ideas?