Components not getting displayed

I am working on Flash 8, trying to place User Interface components (UI Scrollbar) on the stage. But when i do so and test the movie, only the border of the component is getting displayed. ( a thin rectangular box). I have added to nearly 12 layers and 4 frames.

Note: If i place a component in a new file (1 layer and 1 frame) it works perfectly.

Can anyone help me?