Dear Ben,
I tried your suggestion and it was successfull. Then I saw that something doesn't work regularly. Basically, in my page there are three main collapsible panels (#1, #2, and #3). Also there are two seperate collapsible panels (#4 and #5) in the content of the first collapsible panel (#1). All panels have their own colors, fonts, background images, etc. After all, When I select them one by one, some features in some collapsible panels are active, others are inactive. One more thing, all collapsiple panels are placed in a TabbedPanel (see below Figure).
Thanks.