Hi Dragan ...

>Therefore, a rule of thumb: give your subclasses meaningful names, different from parent names.

I can't use different name for the subclasses ... because i use this equivalence in the engine of Verticalization of programs.

There is no problem and all work very fine, but when in design mode i use two sublasses there is this problem ... the only way to avoid the merging is to work with one subclass ... so issue a CLEAR ALL and work with the other subclass.

Anyway i consider this behavior an error.

Bye

PS: Sorry for my bad English.

Emanuele