Evaluation of graphical program nodes. A first graphical program may be displayed on a display. The first graphical program may include a plurality of interconnected nodes which visually specifies functionality of the first graphical program. User input may be received which selects at least one of the plurality of interconnected nodes while editing the first graphical program. A second graphical program may be automatically generated based on the user input. The second graphical program may include the at least one node. The second graphical program may be executable to allow the user to evaluate the at least one node. The second graphical program may be displayed on the display.