save value in IB plugin

hello, I have next situation:

I create own controller class with some properties, an implement IB Plugin for this controller. Next I create Inspector file with some text field and bind them wit properties of my controller; Its all work.

BUT: When I try to save my .xib file in new application wit my controller, it is don't save values of properties witch I set in Inspector.

can You tell me what i don't implement for save properties of my controller in the .xib file?