Thanks for your answers.
The example is in '1001 thing you want to know about VFP's 6. chapter. There's a combobox class called 'cbobase' in it and also a new property for this class called 'acontents'. I would like to knwo how this new property's value (in the proprties/other) can be disabled.
I can modify or create new property but its value stays changable. Why is it that this 'acontents' property's value cannot be modified.

TIA