1. A method that facilitates development of a graphical user interface (GUI) for an executable application, the method comprising: presenting a user interface (UI) control of a GUI on a display of a computing system; receiving UI interaction that is associated with the UI control; in response to the received UI interaction, determining whether to perform a design-time action or to perform a runtime action of the UI control; and based upon the determining, performing the design-time action of the UI control or performing the runtime action of the UI control.