From the File menu, select the menu item Test (or press F2). This invokes the painter's "test mode" in which the form you are defining can be tested. The window and form objects are created and then displayed exactly as they would under Zim program control. You can enter data into the entry field and click on the push button. When you click on the push button, the Test Mode - Event Vector dialog is displayed as, by default, the "click" callback event is associated with all push buttons. This dialog displays the event information resulting from clicking on the push button. This information is accessible from the Zim language for program execution control. Click on the Close push button (or press Escape) to dismiss the dialog and return to test mode. Double click on the test window's system menu bar (or press Escape) to exit test mode and return to layout mode.