In FoxPro 2.6, the foundation READ was used to emulate event-driven programming by providing an event loop and handler. In Visual FoxPro, you can take advantage of the native event loop by converting your foundation READs.
To move a foundation READ into Visual FoxPro
Also, check the settings of the form set WindowType property for your converted screens. In FoxPro 2.6, you coordinated screens through READ and READ MODAL statements. These statements are converted to the WindowType property when you convert your files. For backward compatibility, the property is automatically set to 2 or 3, depending on the READ mode of the original screen. To enable full event model functionality once you’ve converted foundation READs, change the READ compatibility mode of screens, remove extra pages and page frames, and change form methods. For more details, see Overview of READ Compatibility Architecture and Checking Converted FoxPro 2.6 Screens.