Carlos,

I don't know why it doesn't have one, but with inheritance it hardly matters because a simple change to your custom baseclass can fix the problem everywhere.

> I'm asking me why checkbox doesn't has a readonly property.

> Will do in VFP 6?

This is a list of classes with a ReadOnly property from the VFP6 help file: CheckBox, Column, ComboBox, Cursor, EditBox, File Object, Grid, Spinner, TextBox