Focus manager is not working in Flash lite 4.0

Dear All,

I am working on development of UI components in flash lite 4.0. And i am using Focusmanger class to handle focus of all components present in the stage. I don’t have any issues when the component is running in flash player 10. But i am getting some issues if i test the same component in deceive central.
Eg: I will place 2 cobobx component on a stage. Focus first combobox and click enter list items will open.
I will try to navigate between the combo item. At the last combo item focus is going outside the component. As per the requirement focus should not go outside until user clicks enter again. Looking for valuable solution for this.

Thank you
Nidhi