Summary:	Build Pop-Up Menu
Occurs:	When the system generates the pop-up menu from a right click
Details:	"This is the routine where you specify on the fly what your popup menu will look like. It is called everytime the user does a popup, so you can change it based on where the user clicked or internal state if you choose. Currently, if popups aren't specifically disabled, you'll automatically get the standard popup items for terminals if they popup on a terminal." Create your menuSpecs here from scratch. "You shouldn't modify the external node during this routine; just describe the menu." where can be used in this step: "Indicates where the user clicked inside your specified bounds." For reply, specify 0: "The reply is ignored in this routine." For errOut, specify 0 for noError.