Hi Jerry,

>I use _screen.property to store the variables (instead of using public), but now I worry if I have too much _screen.properties, is there certain limit for that?

Yes, the maximum number of properties, methods and events is about 65,000 for each object. However some are already used by VFP which is why the actual limit is much lower (more than 60,000 usually). Due to the way properties are stored internally, accessing properties gets slower the more you add.