The ui package These topics cover the built-in classes for the ui class The Interface class The ui.Interface class provides methods to manipulate the user interface. The Window class The ui.Window class provides an interface to the window objects create with the OPEN WINDOW instruction. The Form class The ui.Form class provides an interface to form objects created by an OPEN WINDOW WITH FORM or DISPLAY FORM instruction. The Dialog class The ui.Dialog class provides a set of methods to configure, query and control the current interactive instruction. The ComboBox class The ui.ComboBox class provides an interface to the COMBOBOX form field view in the abstract user interface tree. The DragDrop class The ui.DragDrop class is used to control the events related to drag & drop events.