One embodiment of the invention comprises a system and method enabling a guard condition for a statechart to be defined using graphical data flow code. Another embodiment of the invention comprises a system and method enabling an action for a statechart to be defined using graphical data flow code. The statechart may be created in response to user input, e.g., user input to a statechart development environment that includes a graphical statechart editor. The graphical data flow code that defines the guard condition or the action may be created in response to user input to a graphical data flow code editor. In some embodiments the graphical data flow code editor may be integrated with or embedded in the graphical statechart editor.