WinStudio
If the Required property is set on a component, WinStudio requires that the component have a value before the user can save the object. If data is not entered into the component and if the Validate Immediately property is set, the user is prompted to enter data before tabbing away from the component.
Components that are bound to required IDO properties are automatically required regardless of the setting of the Required component property.
To require a component:
You can also use the Required When property to make components required based on certain conditions.
About Inheritance from IDOs, Component Classes, and Property Class Extensions
Data Types and Properties for Components