Can you be more specific on what kind of drawing you want?
Have you looked at the "Using a button or switch to control servos" example under the "Example Scripts" section in the Maestro user's guide? That script should give you a general idea of how to read the state of the button and execute the associated movement by relaying the output signal from the Maestro to the jrk with standard hobby RC pulses.
If you try writing some code and have trouble getting it to work, you can post your entire code here, and I would be happy to take a look.
By the way, if you have not gotten the Maestro yet, you might find it easier to control the jrk via serial using a microcontroller like one of our Arduino compatible A-Star 32U4 boards instead of the Maestro's RC signals. I recommend looking at the "Using the Serial Interface" section of the jrk user's guide for more information about the interface and the commands available.