Methods, systems, and computer program products are provided for controlling a GUI display for a plug-in in an application supporting plug-ins. Embodiments include receiving, at run time, in the application from the plug-in a request to display a GUI object; responsive to the request, retrieving an XML representation of the GUI object; and displaying the GUI object in dependence upon the retrieved XML representation of the GUI object. Typical embodiments also include receiving from the plug-in a request to retrieve user input responsive to the GUI object; and returning to the plug-in responsive user input.