Pop Up button binding strange trouble

I'm trying to using pop up button in my code. This is how it look:

This开发者_如何转开发 is binding configuration:

Import Choice List local attributes is array controller has reference outlets in appDelegate main code, and i update it as

 [tempArray setContent:carriersListArray];

Everything work fine, but when i select something from button, i lost one of possible choice from the list, it's moving out and leave double choosing issues:

This is happened, when u r using a same key name for selection and content. To solve it just using a different key's for it.