1. A computer-implemented method for specifying timing in a graphical program, wherein the method for specifying timing operates in a computer including a memory, a display and a user input device, the method comprising: displaying on the display a first timing node in the graphical program; displaying on the display a plurality of timing type options for the first timing node; receiving user input specifying a timing type from the plurality of timing type options; determining a second timing node based on the user input specifying the timing type; and displaying the second timing node on the display in the graphical program in place of the first timing node, wherein the second timing node is operable to configure timing functionality for the graphical program in accordance with the timing type.