"Test mode" enables you to interact with the objects you have been designing. Test mode is invoked by selecting Test from the File menu or by pressing F2. The objects you are designing are temporarily created and displayed as they would appear under Zim language control. You can enter data into entry fields, select or clear check boxes and radio buttons, scroll list boxes, click on push buttons, select menu items and so on. If you have selected certain callback events to be active for some objects, then when a callback event occurs, the Test Mode - Event Vector dialog is displayed. This dialog presents the information describing the callback event that is accessible from the Zim language.
To exit from test mode and return to layout mode, you can press Escape, Ctrl+F4, Alt+F4 or double click on the test window's system menu, if one is present with an active Close option.