adding selection box into a tabbed panel

Hi,

I’ve used the sample code in “Build a tabbed panel” to build a tabbed panel with 8 panels. Each panel has one form. I have no problem adding checkbox, radio buttons, or text input type into the form in the tabbed panel. They are displayed andhidden as expected when the corresponding tabbed panel is clicked. If I add a selection list into the form in any one of the tabbed panels, the selection list will show up in all the tabbed panels. How do I make the selection list only show up in the form/panel that I’ve added to?

The tabbed panels code uses

with clipping and z-index to swap tabbed panels.

Any help is appreciated!
Thanks,
Ai-Lan