Editing Sub-Panels in a JTabbedPane with Gui-Desinger

Hi

how do I add complex JPanels to a JTabbedPane?

Whenever I try to add a new Tab, I can only add one Button or one Label. But when I add a JPanel, I can't add any components to that panel!
But ususally you want more than one component in one tab, don't you?

matt