Stutoring Navigation Problem, Please help!

Hi i am trying to creat a navigatio bar. I have a graphics symbol called Navigation Border which is used to incompus the naviagtion words e.g home of type static text. Everytime i try to add a navigation name being static text e.g home, and test the move, the text always flashes??? Can somebody tell me why this is happening and how to rectify this.

P.S i am pretty new to flash

Thanks