Cannot modify a base class (Error 1731)
You have attempted to modify a Visual FoxPro base class.
To make modifications, you must first define your own subclass based on the Visual FoxPro base class.
Deze browser wordt niet meer ondersteund.
Upgrade naar Microsoft Edge om te profiteren van de nieuwste functies, beveiligingsupdates en technische ondersteuning.
You have attempted to modify a Visual FoxPro base class.
To make modifications, you must first define your own subclass based on the Visual FoxPro base class.