I would suggest to go for the descriptive programming for Flex Applications.
As long as you have add ins and able to recognise the objects, you should able to add in the OR also. Try with either way to add, Open the application and then open the QTP, then try to add objects or other way.
There are couple of requirements for flex. You need to have flex plugin. You need to have automation swc file for QTP from developers with flex property. There are few previous threads that discussed this setup.