>When we subclass we cannot remove any object in the subclassed class. Is it possible to overcome that and remove some objects?

As the others had said, you may want to rethink your class rather than going this way.

If you don't have the time, the simplest way is to just return .f. from such objects' .init - which will make them not instantiate. If they are mentioned in code anywhere, though, this will cause a nasty error.

Another way is to just make them invisible (by setting this.visible=.t. or this.left=-2000 in .init) if possible. Not sure you can do this for all possible kinds of objects - pages in a pageframe, or columns in a grid - but it would work for those that have these properties.