"Victor Irzak" <virzak@rogers.com> wrote in message
news:%23keGj1BGEHA.2052@TK2MSFTNGP11.phx.gbl...
> Hello,
>
> I have a class Processor that contains a collection (derived from
> CollectionBase) of Processor objects.
>
> In design-time if I try to open 4 or more nested collection editors and
then
> close them, I get "Object reference not set to an instance of an object"
> error.
>
> Did anyone encounter this problem? What can be done about it?
>
> Victor
>
>