Q: Is there a way to place some graphics below the accordion panel component, that would move at the same time when it collapses and expands the items ?

A: The solution is to create an extra style for the last item that contains empty movie clips for the header clip (the header will not be displayed and used). Next, using the xml file, add the last item in the <data> node, containing the path to that graphics you need to use. In the xml file, for this last item, set the contentSize attribute to the size you need, the expanded attribute to "true", the title should be an empty String and the contentEvents attribute to "false". Also set the style attribute for this item to the new style created in the .xml file. Here is an example of the node:
<item title=""  contentPath="InternalClip" contentSize="300" contentEvents="false" expanded="true" style="style2" />

Also, the component has to have the expandMode property set to "all".
Files: AccPanel_GraphicsBelow.zip