John,

>I faced problem that, my value of my property just changed accidentally. I placed breakpoint at my properties' setter method, but it doesn't seem to be fired.
>
>Is there any way for me to do something like VFP debugger, break once my expression is true, but NOT fixed at particular location?
>
You could also highlight the property name and do "CTL F" with current project set and find all the places it is being referenced. It may be that your private variable is being changed directly rather than through the property. Or just comment it out, build and locate all the errors.

Tim