Export/Import CliXML issue

Hi,

I have a object  of own class which store some properties.
In script  I send this object to PropertyGrid and everything works fine.

To store values of properties I use Export-CliXML  cmdlet.

In the next session I execute Import-CliXML and send this object to PropertyGrid but in such a case all categories are gone as well as all parameters become read-only.

How can I restore this object properly to have writable parameters  with categories ?

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